I haven't been following the 3G world for over a year, so forgive my elementary question. I have a 3G. It has no service and has 3.0.1 on it. Is there any reason I should not update it to 3.1.3? When I actively used the 3G, I could restore any firmware version but of course, not the baseband. I read ios4 has mixed reviews on this device. If I am to keep it as a spare, should I leave it at 3.0.1? Upgrade to 3.1.3? Does it matter with a 3G at this point?