Unable to register my phone number
I tried to add the phone number but get message Cannot Verify Phone Number
This phone number is already in use
with another account.
[Image Edited by Moderator to Remove Personal Information]
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This phone number is already in use with another account.
That's right, you can only use a phone number with one account, that's also the case with WhatsApp and other social media apps.
So, check your account(s).