I have had a thunderbolt for a little over a year, and the old one worked just fine, until i broke the charge port. My refurb replacement, seems good, except I can't play youtube videos on 4g. It works with wi-fi or 3g, but not 4g. I have seen this issue before with other people in forums, but cant seem to find a solution. Its just strange, because my old phone didn't have this problem. I have uninstalled youtube, adobe flash, cleared internet cache, restarted multiple times, and cant get it to work on 4g. very frustrating.