So I just got my new Samsung Galaxy S4 Active yesterday. I was able to send text messages yesterday, but all of a sudden today they fail when trying to send. It doesn't even "try" to send, it just automatically fails. I can do everything else with my phone, get on the internet, facebook, send and receive calls, receive text messages.. I ALWAYS have a strong signal when trying to send messages. I have taken all steps to fix this problem, remove the battery, power off the phone, restore it, download another text app, nothing works. AT&T doesn't even know what is wrong, so I am hoping someone on here can help! Please help!!!! Thanks!!!