iOS 7 has a known texting issue where a text will not go through to the recipient and, instead, you will get an error message that reads "invalid 10-digit number or short code." Here is how to fix that problem:
1. Delete the Contact you are trying to send the text to.
2. Delete all message threads with that Contact.
3. Open a new message and start typing in the Contact's name. When the Contact's name appears in the drop down list, tap on the "i" in circle icon and tap "Remove from Recents."
4. Type in full 10-digit contact number and send a test text. If it goes through, the issue is resolved and you can add the person back into your contact list. If the test did not go through, call your wireless provider and ask for additional help.
Omg! Not doing this to all my contacts! Sigh.
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