Hi! I just got an LG Optimus G Pro and I do love it. But lately any time I leave an area that has wireless I can no longer get on the internet with my phone. The 4G icon at the top of the screen used to show up any time I was without wireless, but for the past week it hasn't been and I cannot access the internet unless I have wireless internet. Any suggestions on what the problem is and how to fix it? Thanks!