Help with cell phone connection?

fefewfd

New member
I text my girlfriend quite often. I use At&t, whereas she uses MTA. For months weve been texting eachother without any problems, but this morning when she tries to send me a text messege, her phone would say that (my cell phone number) is invalid. Further yet, if i send her messeges she wouldnt get them. Any advice on how to fix this?
 
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