Very frustrated. I am having the same texting error as many users - somehow an extra "1" is getting added and I receive "error invalid number" responses. I went to an AT&T store yesterday, they replaced my SIMM card, which didn't help, but said it was a known issue and would be resolved soon. Now AT&T is saying it is resolved in network, but it isn't. I have tried every single suggestion found on this site and others - deleted the contact, all text strings, reset Network Settings, restarted, manually entered the number, and am still having this issue with the single most important contact I have. PLEASE HELP.
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