Hey Dennis, I didn’t use Firebase.

Thank you for your prompt feedback, I want to do something similar to Whatsapp, authenticate users and you can see people on your address who have Whatsapp installed on the contacts section. I am guessing Whatsapp has to save the users number to be able to sift through your address book and find users who are on their database and display them on your contact list?

I have been using Firebase for my backend and I still want to use it to save users who have been successfully authenticated.

Is there a way to customize the SMS message sent to the user?

Thank you.

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