I too am having the same problem that just started this week, but on only one of my contacts. If I reply to a text from my daughter, it drops the area code; if I try to send a text from the contact list, the area code shows in the contact, but drops it in the text; if I goto compose new text and type her name, the correct 10-digit number shows up and it goes through. I have deleted all threads between us, deleted her contact, hard reboot and added new contact, but it still wants to drop the area code. If I put in a fake number and send a text from contacts, the area code is included, but not her cellphone number. It is very frustrating and can't figure out why, on her number only, that the area code keeps dropping in messaging!!! Help, if anyone knows why this is happening 2 months after updating my phone and why only on this one particular number...