When I try to assign a ringback tone to a specific contact I am getting an error that says "invalid mobile phone number". The number is right and the ringback tone will assign to another contact. Why not this one?
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Is there something unique about the number? Different carrier? Do calls from that number deliver the caller id? Have you tried deleting the contact and adding it back?
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Thank you. I didn't try removing contact and adding it back in. That worked. Feliz Navidad