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4701440 Error Invalid Number. Please re-send using a valid 10 digit mobile number or valid short code error message

Have seen online that this has been solved. Solution please? Have tried many options (delete account of person who's text always gives me error message, just enter the phone #) plus other options. Error message:

4701440 Error Invalid Number. Please re-send using a valid 10 digit mobile number or valid short code always pops up. Person can send me text. When I reply, same outcome

iPhone 6, iOS 10.3.2

Posted on May 24, 2017 5:30 AM

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Posted on May 24, 2017 3:04 PM

Was not clear. Have always entered the actual 10 digit number. Additionally have deleted the contact, have turned on/off imessage, (per AT&T discussion though the recipient does not have an iphone) have reset the phone and network settings, have done everything that every post I've read mentioned. Nothing has worked. Have even turned off dial assist (even though one post said make sure it's on).


She can text me, I can't even reply. I've never ever been able to text her. Always get the following error code:

+1 (1) (216) 116-11 I don't have trouble texting anyone else (iphone or android)

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4701440 Error Invalid Number. Please re-send using a valid 10 digit mobile number or valid short code error message

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