How can I check whether my client's phone number is connected to an existing WhatsApp account?

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• Could I register our existing number of WhatsApp Messenger App or WhatsApp Business App to official WhatsApp Business API?

  Yes, but you need to delete all the related WhatsApp services to this number before submitting API registration. Please manually export the conversation and contacts from the WhatsApp account before deletion. To delete your account 1. Open WhatsApp. ...

• How should I choose a phone number for WhatsApp?

  You must use a valid phone number and include the country and area code. The phone number must be able to receive calls or SMS for account verification. There are 3 types of eligible phone numbers: - Landlines - Cell phones – can be used as long as ...

• Do I need to save the WhatsApp number before sending message to the business account?

  No. It is not necessary to save the number to send messages to any WhatsApp number. You can send messages via the wa.me link (https://wa.me/{WhatsApp number with country code}, i.e. https://wa.me/85268227287). Click here for more details. 

• I have a smartphone with the phone number assigned to WABA. Do I have to keep this device connected or online? Does WhatsApp check that the line is active? Can I switch off the device and have the Stella chatbot still work?

  If you have registered a phone number with WABA (WhatsApp Business API) in Stella, there is no need for the use of a device as there is no interface for WABA. Also, if you have registered a phone number with WABA. that number could not be used on any ...

• Can we reuse the phone number previously submitted to WABA for our personal WhatsApp or WhatsApp business account?

  Yes, please find the process of offboarding a phone number: If the number is registered with the embedded signup: 1. Head to the WhatsApp Business Account in Facebook Business Settings Page  2. Select the WhatsApp account that is tied to the phone ...