I have my original iPhone running 3.0. I use Tmobile (USA). iTunes 10.1. Wondering if anyone would be so kind as to tell me if I can safely go any higher with the iPhone software? I swore I'd not do it again, but as more and more apps don't work with my phone, I'd like to know if I can indeed go farther. I can probably find links if anyone could please share the names of the websites/programs/whatever I need? I have zero issues with any part of the phone right now, so I do feel leery tempting fate once more. I also need to make sure I don't screw up and can unlock it again. Thank you in advance for any advice. I wish I could say I was less of a newb after all of this time, but honestly, when it comes to the iPhone, tutorials are my friend.