Been having the same issue this week. Even though I'm not at full bars, I have never had issues being able to play video or music, now I can't even use duolingo. I have unlimited data so its shame that my money is going to waste. Tried resetting, airplane, switching signals, basically all the simple troubleshooting methods. My zipcode is 78616 if that helps. Hopefully its momentary issue because it was a good plan I had.