My significant other has an old iPhone (I want to say it's a 3GS ?) that is currently jailbroken on 4.3.3. It still has an unlimited data plan, so we usually just use it to run PDAnet to create a hotspot for our iPads when travelling (work requires her to use and pays for her Blackberry). Here is my question:
Given that the hardware is relatively old, is there any benefit from upgrading the device to 5.0.1 or will it become slow/sluggish and drain the battery even more quickly? Or have they made advances in 5.0.x that will increase the battery life?
If I decide to upgrade while I still can, I want to jailbreak it again, of course. I just downloaded the latest verison of redsn0w (0.9.10b4), and have read the two tutorials in this forum. Do I understand it correctly that I *must* create a customized IPSW file to jailbreak the iPhone, or is that only if I want to unlock the phone at the same time? Do I have to go through the "Extras" menu to create that custom file before going through the jailbreaking process itself?
And just to be on the safe side -- this JB is untethered, right?