I went into US Cellular today to ask about a glitch I've been having and the lady told me to update my system on the US Cellular site. So today I did, but after it got done, my phone froze on the Galaxy start up page. After I turned my phone back on, it was stuck in Safe Mode. So I turned my phone off, took out the battery for 1 minute, and then turned my phone back on, and it was normal. But then it completely froze, and I had to turn it off again. Now, it is stuck in Safe Mode and it keeps on telling me that I have no signal. Can anyone tell me what's wrong with my phone and/or how to fix it?