Many businesses have spent years building customer recognition around a single WhatsApp Business number. That number may already appear on the company website, social media pages, advertisements, signboards, invoices, product packaging and business cards. Existing customers may also have saved it as their main contact number for enquiries, orders, appointments and support.
When the business wants to introduce WhatsApp marketing, automation or integration with another system, an important question naturally arises:
Can we use our existing WhatsApp Business number for marketing without changing the number or giving up the WhatsApp Business App on our phone?
For eligible businesses, this is now possible through WhatsApp Coexistence. Coexistence allows a supported number that is already registered with the WhatsApp Business App to connect to the official WhatsApp Cloud API while continuing to operate through the mobile app.
This means a business may not need to choose between personal replies from the phone and API-based automation. The same eligible business number can support both working methods.
With WebWMS2U, businesses can connect a supported WhatsApp Business number and add approved marketing campaigns, message templates, scheduled messaging, automated replies, phonebooks, webhooks, API integrations, AI-assisted responses and campaign reporting.
Can You Use an Existing WhatsApp Number for Marketing?
Yes, an eligible number already registered with the WhatsApp Business App may be connected to the official WhatsApp Cloud API through WhatsApp Coexistence.
Once the connection has been completed successfully, the business can continue using its established WhatsApp Business number instead of introducing a completely new number solely for marketing and automation.
This is useful because customers are generally more likely to recognise and trust a number they have previously used. A sudden change of number can create confusion, particularly when the original number has been promoted for a long time.
Using the existing number can help preserve:
- The customer recognition associated with the number
- Existing contact information displayed on websites and social media
- The convenience of replying through the WhatsApp Business App
- The established communication habits of employees and customers
- The company identity associated with the WhatsApp Business profile
However, connecting an existing number does not mean the business can send unrestricted promotional messages. WhatsApp marketing remains subject to customer consent, Meta messaging policies, template approval, quality controls and applicable messaging charges.
What Is WhatsApp Coexistence?
WhatsApp Coexistence is an official method for connecting an eligible WhatsApp Business App number to the WhatsApp Business Platform, which includes the Cloud API.
The word coexistence refers to the ability of the WhatsApp Business App and compatible Cloud API functionality to operate alongside each other using the same supported number.
Before Coexistence was available, businesses frequently believed that moving a number to the WhatsApp API meant that the number could no longer remain active in the WhatsApp Business App. This often discouraged smaller companies from adopting official automation because employees still needed the convenience of replying from a phone.
Coexistence provides a more practical arrangement. Employees can continue handling human conversations through the mobile application while a platform such as WebWMS2U provides additional marketing and automation capabilities.
In a typical setup:
- The business retains its eligible existing WhatsApp Business number.
- Employees continue using the WhatsApp Business App for normal conversations.
- WebWMS2U connects through the official Meta Cloud API.
- Approved campaigns and templates can be managed through WebWMS2U.
- Compatible incoming and outgoing message events can be processed by the platform.
- Automations, APIs and webhooks can be added to the communication workflow.
Businesses interested in the connection process can refer to the WebWMS2U WhatsApp Coexistence Setup Guide.
Why Businesses Prefer to Keep Their Existing WhatsApp Number
A business telephone number is part of its identity. Customers may use the same number for telephone calls, WhatsApp conversations and follow-up enquiries. Replacing it can create unnecessary operational and marketing work.
For example, a company changing its WhatsApp number may need to update:
- Its website and contact page
- Google Business Profile and online directories
- Facebook, Instagram and other social media accounts
- Printed brochures and business cards
- Signboards, banners and product packaging
- Quotations, invoices and email signatures
- Customer service documentation
- Advertisements that use Click-to-WhatsApp links
Even after these details are updated, some customers may continue contacting the previous number. This can result in missed enquiries and uncertainty over whether the new number is genuine.
WhatsApp Coexistence helps eligible businesses avoid this disruption by letting them add API capabilities to a number their customers already recognise.
Do You Need to Buy a New WhatsApp Number?
Not necessarily. If your current WhatsApp Business App number is eligible for Coexistence, you may be able to connect that number directly through Meta's official onboarding process.
A new number can still be useful when a business wants a completely separate channel for campaigns, notifications or customer support. For example, a larger organisation may prefer different numbers for sales, support and appointment reminders.
However, for a small or medium-sized business with one established customer-facing number, using the existing number may be more convenient.
The decision generally depends on the company's workflow:
- Use an existing number through Coexistence when employees need to continue using the WhatsApp Business App and customers already know the number.
- Use a dedicated Cloud API number when messaging will be managed primarily through a central platform, API or automation system.
- Use separate numbers when different departments require independent identities, permissions or communication processes.
Can You Continue Using the WhatsApp Business App?
Yes. Continuing to use the WhatsApp Business App is one of the main benefits of Coexistence.
Your staff can continue opening the app, reading conversations and answering customers from the phone. At the same time, WebWMS2U can provide compatible campaign, automation and integration features through the official Cloud API connection.
For example, a company could send an approved product announcement through WebWMS2U. A customer who is interested may reply to ask for further information. A salesperson can then continue the conversation personally through the WhatsApp Business App or use the available WebWMS2U chat tools.
This produces a practical combination:
- Automation handles repetitive or scheduled tasks.
- Employees handle conversations that need judgement or personal attention.
- Customers continue communicating with a familiar business number.
The exact message synchronisation behaviour may depend on Meta's supported Coexistence events, permissions and the connection configuration. Businesses should perform tests after onboarding to confirm how their intended workflow operates.
WhatsApp Business App, Cloud API and Coexistence Compared
| Feature | Business App Only | Cloud API Only | Coexistence with WebWMS2U |
|---|---|---|---|
| Use WhatsApp Business App on phone | Yes | Normally no for the same standard API-only number | Yes, for an eligible connected number |
| Keep an established Business App number | Yes | May require migration or a different number | Yes, subject to eligibility |
| Send approved API marketing templates | Not as a Cloud API campaign | Yes | Yes |
| Scheduled platform campaigns | Limited | Yes | Yes |
| API and webhook integration | No official Cloud API integration | Yes | Yes |
| Keyword and chatbot automation | Basic app features only | Yes, through a connected platform | Yes, through WebWMS2U |
| Reply manually from phone | Yes | No for the API-only number | Yes |
| Central campaign reporting | Limited | Yes | Yes |
What Marketing Features Can WebWMS2U Add?
The WhatsApp Business App is useful for direct conversations, catalogues, greeting messages and basic business communication. WebWMS2U extends this with tools intended for structured campaigns and business automation.
1. Approved WhatsApp Marketing Campaigns
Businesses can prepare campaigns using approved WhatsApp message templates. These campaigns may be used for product announcements, promotions, event invitations, seasonal offers, customer re-engagement and other permitted marketing purposes.
Recipients should be selected from customers who have agreed to receive the relevant type of communication.
2. Scheduled Messaging
A campaign can be prepared in advance and scheduled for an appropriate date and time. This is useful when promotions need to coincide with a product launch, festive period, event registration deadline or business announcement.
3. Contact and Phonebook Management
Customer numbers can be organised into suitable phonebooks or recipient groups. Instead of sending the same content to every customer, businesses can create more relevant audience segments.
For example, a retailer could separate customers by product interest, while a tuition centre could organise contacts by programme or student level.
4. Message Templates
Business-initiated WhatsApp messages outside an active customer service conversation may require an approved template. WebWMS2U helps users work with their available Meta templates when preparing compatible campaigns.
A marketing template can contain appropriate text, variables, media and action buttons, subject to Meta's current template rules and approval.
5. Keyword-Based Automatic Replies
Keyword automation can provide an immediate response when a customer sends a particular word or phrase. A customer who sends “PRICE”, for example, could receive information about available packages. A customer who sends “LOCATION” could receive the business address and map link.
This can reduce repetitive work while still allowing employees to take over when the customer needs personal assistance.
6. Chatbots and AI-Assisted Responses
Businesses can use chatbot workflows or compatible AI-assisted features to answer common questions, guide customers towards relevant information and provide faster initial responses.
Automation should be designed carefully so customers can still reach a person when their enquiry cannot be handled properly by the automated flow.
7. API Integration
WebWMS2U includes API capabilities that can allow websites and business applications to request WhatsApp messages.
Depending on the implementation, this can support workflows such as:
- Sending an acknowledgement after an online form is submitted
- Sending appointment or booking information
- Providing order and delivery updates
- Sending payment-related notifications
- Following up on a customer enquiry
- Connecting WhatsApp messaging to an internal business system
8. Webhooks
Webhooks allow compatible message events to be sent to another application. This can help a business update its own records, start an automation process or notify another system when a WhatsApp event occurs.
9. Campaign and Message Reporting
A web-based platform provides greater visibility over campaigns than relying entirely on manual messaging from a phone. Businesses can review message processing and available delivery information to understand what happened during a campaign.
Practical Examples for Malaysian Businesses
Using an existing WhatsApp number for marketing can support many types of Malaysian businesses.
Retail and E-commerce
A retailer can announce new products, selected promotions, restocked items or seasonal campaigns to customers who have opted in. Interested customers can reply to the same familiar number and continue speaking with a salesperson.
Clinics and Healthcare Services
A clinic can use WhatsApp for permitted appointment information, operational announcements and appropriate service updates. Messages should be designed with particular care for privacy and applicable healthcare requirements.
Tuition Centres and Training Providers
A tuition centre can announce new classes, registration periods, seminars or holiday programmes to parents and students who have agreed to receive updates.
Property Agencies
Property agents can follow up with opted-in prospects, share relevant project announcements and invite interested customers to viewings. Responses can continue directly through the agent's familiar WhatsApp Business number.
Restaurants and Food Businesses
A restaurant can inform participating customers about new menus, festive reservations, selected offers or event packages. Customers can respond to make an enquiry or request a reservation.
Service Companies
Repair services, maintenance companies and professional service providers can send permitted reminders, service updates and relevant offers while retaining their established customer contact number.
How to Connect Your Existing Number to WebWMS2U
The precise screens may change as Meta updates its onboarding process, but the general flow is as follows:
- Create or sign in to your WebWMS2U account.
- Open the Meta WhatsApp number management section.
- Choose the option to connect a WhatsApp number.
- Continue through Meta's official embedded signup window.
- Sign in using the appropriate Facebook account.
- Select or create the required Meta business portfolio and WhatsApp business account.
- Choose the option for connecting an existing WhatsApp Business App number when it is presented.
- Enter and confirm the WhatsApp Business number.
- Follow the linking instructions shown by Meta and the WhatsApp Business App.
- Review the requested permissions and complete the connection.
- Return to WebWMS2U and confirm that the number appears correctly.
- Perform inbound, outbound and app-originated message tests.
The person completing onboarding should use the correct Meta account and should have suitable access to the company's business portfolio. The WhatsApp Business App should also be available during the connection process.
For a visual walkthrough, visit the WhatsApp Coexistence Setup Guide.
Important Checks After Onboarding
After the number has been connected, test the complete business workflow before starting a marketing campaign.
Recommended tests include:
- Send a normal customer message to the connected number.
- Reply from the WhatsApp Business App.
- Reply from the WebWMS2U chat interface where applicable.
- Send an approved template through WebWMS2U.
- Verify that the intended source number is used.
- Check the message queue and available delivery status.
- Test keyword automation with a controlled test number.
- Test any website API or webhook integration.
Testing helps confirm that employees understand which messages are sent from the app, which are sent through the API and how customer responses should be handled.
Customer Consent Is Still Required
WhatsApp Coexistence does not remove the need for customer consent. A familiar number should not be treated as permission to send unsolicited promotions.
A business should obtain an appropriate opt-in before sending marketing messages. The opt-in should make it reasonably clear that the customer is agreeing to receive WhatsApp communications from the business.
Consent may be collected through suitable methods such as:
- A website registration or enquiry form
- An online checkout option
- A membership registration process
- A customer service conversation
- A physical form or in-store registration process
- A Click-to-WhatsApp interaction with appropriate disclosure
The business should retain suitable records of how consent was obtained and respect requests to stop receiving marketing messages.
WhatsApp Marketing Templates
When a business initiates a marketing conversation through the Cloud API, it may need to use a Meta-approved marketing message template.
A useful template should be clear, accurate and relevant to the recipients. It should identify the business and explain the purpose of the message without misleading claims.
Depending on Meta's current rules, a template may include:
- Text content
- Personalised variables
- An image, document or video header
- Quick-reply buttons
- Website or telephone action buttons
Submitting a template does not guarantee approval. Meta reviews templates and may reject content that does not comply with its requirements. Approved templates can also be paused or affected if recipients respond negatively or the number's quality declines.
Avoid Treating WhatsApp as an Unlimited Bulk-Blasting Tool
WhatsApp marketing works best when the messages are expected, relevant and useful. Sending excessive or unrelated promotions can lead recipients to block or report the business.
This can harm customer trust and may affect the quality status or messaging capability associated with the number.
Better campaign practices include:
- Send only to customers who have opted in.
- Segment recipients according to genuine interests.
- Avoid sending every promotion to the entire database.
- Use accurate and recognisable business information.
- Keep messages concise and useful.
- Avoid misleading urgency or unclear offers.
- Do not send too frequently.
- Provide a simple way for customers to opt out.
- Remove opted-out recipients from future campaigns.
- Monitor campaign performance and customer feedback.
The goal should be to create a useful customer communication channel rather than maximise the number of messages sent.
Coexistence Versus a Dedicated Cloud API Number
Both arrangements can be useful, but they serve different operational needs.
Coexistence may be suitable when:
- The existing number is already well known.
- Employees must continue using the WhatsApp Business App.
- The company wants a gradual transition towards automation.
- Personal replies remain an important part of customer service.
- The business wants campaigns and automation without abandoning the app.
A dedicated Cloud API number may be suitable when:
- The number will be handled entirely through a central system.
- A customer service team manages conversations from a shared platform.
- The business wants a separate number for notifications or campaigns.
- The number does not need to remain active in the mobile app.
- The business requires a clearly separated communication channel.
WebWMS2U supports official Meta Cloud API messaging and eligible Coexistence onboarding, allowing a business to select the arrangement that best fits its workflow.
Is WhatsApp Coexistence Suitable for Your Business?
Coexistence may be a good fit if you answer yes to several of these questions:
- Do customers already recognise your WhatsApp Business number?
- Do employees still need to reply from the WhatsApp Business App?
- Do you want to introduce approved WhatsApp marketing campaigns?
- Do you need automated replies or chatbot features?
- Do you want to connect WhatsApp to a website or business system?
- Do you want more structured campaign and message reporting?
- Would changing your current number inconvenience customers?
Eligibility and available behaviour can depend on Meta's current requirements, the number's status, account configuration, region and onboarding flow. A business should verify its setup rather than assuming every number will automatically support Coexistence.
Frequently Asked Questions
Can I use my existing WhatsApp Business number for marketing?
Yes, if the number and account are eligible for WhatsApp Coexistence. The number can be connected through Meta's official onboarding process and used with compatible Cloud API marketing features while remaining available in the WhatsApp Business App.
Can I use a normal personal WhatsApp number?
Coexistence is designed around the WhatsApp Business App. A number currently using ordinary WhatsApp may need to be moved to the WhatsApp Business App and meet the applicable onboarding requirements before it can be considered for Coexistence.
Will customers see a different telephone number?
No, when an existing number is successfully connected through Coexistence, customers continue communicating with that same number.
Can employees still reply from their phones?
Yes. Retaining use of the WhatsApp Business App is a central benefit of Coexistence.
Can messages also be managed through WebWMS2U?
WebWMS2U provides compatible web-based messaging, campaign, automation and reporting tools. The exact message visibility and synchronisation behaviour should be tested after onboarding because it can depend on Meta's supported events and permissions.
Can I send promotional messages to all my contacts?
No. A contact appearing in a phonebook does not automatically mean the person has agreed to receive marketing. Marketing recipients should have provided suitable consent, and Meta's messaging policies must be followed.
Do I need an approved message template?
Business-initiated marketing messages sent through the Cloud API generally require an approved marketing template. The requirements can depend on the type and timing of the conversation.
Does Coexistence make WhatsApp marketing free?
No. Meta's applicable charges and WebWMS2U plan or credit requirements still apply. Coexistence refers to the connection arrangement, not an exemption from messaging charges.
Do I need a verified Meta business?
Requirements and available limits can depend on the Meta business account, number and current onboarding policies. Business verification may be required for particular capabilities or increased limits.
Can I switch from an API-only setup to Coexistence?
The appropriate procedure depends on how the number is currently registered and connected. Do not register or delete the number in a different WhatsApp product without first understanding the required migration or deregistration process, as an incorrect sequence could interrupt service.
Will all my historical messages be imported?
Historical message availability depends on Meta's supported onboarding and synchronisation options. A business should not assume that every historical conversation will automatically appear in the connected platform.
Can I test WebWMS2U before choosing a paid plan?
WebWMS2U provides a 14-day free trial with 50 message credits and support for connecting one Meta WhatsApp number, subject to the current trial conditions and Meta onboarding eligibility.
Start Using Your Existing WhatsApp Number With WebWMS2U
Your business may not need to abandon the WhatsApp number that customers already recognise just to introduce campaigns and automation.
With WhatsApp Coexistence and WebWMS2U, an eligible business can continue using its existing WhatsApp Business App number while adding approved marketing campaigns, templates, scheduled messaging, automated replies, API integrations, webhooks and reporting.
This provides a practical balance between personal customer service and business automation:
- Customers continue using a familiar number.
- Employees can continue replying from the phone.
- Campaigns can be managed through a web-based platform.
- Repetitive processes can be automated.
- Websites and business systems can be integrated.
Keep the WhatsApp Business number your customers already know and add the tools your business needs to communicate more efficiently.
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