Hey, i currently have an unlocked Iphone 4 running on tmobile. occasionally the phone will just pop up with "no service" or just 1 bar (with no carrier name). The only way to get it to come back to working on T-mobile is to turn it off and restart it. now the problem is when i restart it, it gets stuck on the apple logo. the only way to get it off that and get the phone back on is to plug into computer and run Redsn0w and "boot tethered device". my first question is is there any way to fix the no service or 1 bar issue without turning the phone off (airplane mode doesnt fix this for me, it just pops up with "INVALID SIM" when i take off of airplane mode. my second question is is there anyway to get my phone re-booted and off the apple logo without plugging into a computer (not always home by my computer where redsn0w is installed)? any help would be great, thanks!