After never having any issue, I am unable to send texts to the UK. I confirmed with AT&T that all the settings are accurate and texting should be allowed. I can receive texts, but cannot respond or start a new message. It worked while at home in the US and when I was traveling in the UK. It stopped working the day I returned to the US. AT&T is working on it, but I figured I would see if any of you have had a similar issue. Any advice?