Error Invalid Message - Can't Text My Mom
My mom got a new number. When I text her I get an immediate reponse text saying "Error Invalid Message: Please re-send using a valid 10 digit mobile number or valid short code."
I went online to troubleshoot. I'm on an iPhone 6plus. I cleared my phone of all incoming and outgoing calls/text to the number. Went to Settings>General>Reset>Reset Network Settings. Once I did that, I started a new text to the number. Still did not work.