Why do I get Error invalid number when I try to send a text to my husband?

Question

I tried to send my husband a text this afternoon from my phone. I keep getting a message from +1 (1) (216) 116-11. It says the following:
7657905 Error Invalid Number
Please resend using a valid 10 digit mobile number or valid short code.  HELP!

Answer 1

My wife had this problem for the past few days for a specific phone number. These instructions fixed it -- without having to restore from backup or contact the carrier.
http://www.timothydeblock.com/blog/2014/5/12/fix-message-sent-using-invalid-numb er-of-digits-msg-2114
Open Contacts -> select the contact -> select edit -> scroll all the way to the bottom and delete contact (delete multiple entries of the same phone number, my wife had five).
Open the Messages app -> select Edit -> select the red circle and then select delete. Do this for both the person and the messages you received.
Open the Settings app -> scroll down and select Messages -> turn off messages, by selecting the switch, and any other options turned on.
Turn off your phone and then turn it back on.
Go straight to messages and compose a new message and put in the phone number of the person you're trying to text. Send and that person should receive the text message. Add the person to your contacts and go back into message settings to turn on any other options you want on that you turned off.
John