I've tried restarting my phone a few times. When I turn my phone back on, the data will work for a few hours and then it goes back to the way it was before.
Yes. When I first turn my phone on, I turn off wifi and turn on data so I can see if it's working. Then I turn the data off and use wifi until I don't have access to wifi. Then I'll turn my data back on and it doesn't work.