Sometimes I can't send text. It asks for a valid 10 digit code. Whats up?

[iMore Question]

Sometimes I can't send text. It asks for a valid 10 digit code.

I have tried repeatedly adding area code, even +1 and area code. Whats up?

 

[Laelipoo]

Re: Sometimes I can't send text. It asks for a valid 10 digit code.

Is it a particular number that never works? Can you send one at all?


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