I have one contact that I can call but cannot text. A return text states it is an invalid number. How can I fix it?

I have one contact that I can call but cannot text. A return text states it is an invalid number. I have erased and re-entered the contact, changed phone identification and tried resetting the network - none have worked. What else can I try?

What kind of phone is this person using? If this is an iPhone, are you logged into iMessage. If this is not an iMessage, then I suggest you both contact AT&T. SMS which is what is used between non-iPhone devices or between an iPhone and non-iPhone device are a carrier function. There is no setting in iOS or on the iPhone that deals with SMS. If you are able to send iMessage and/or SMS to other people, then AT&T needs to either look into your account to ensure SMS is configured, or they need to look at this other person's phone to see what it is reporting as its number since it is coming back invalid for you.

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