Have just got my new (secondhand) 3GS After selling my 3G. I took a backup of my 3G and it had version 3.12, not v4. My new 3GS has v4, so my question is when first connect to iTunes, will it auto back up and place my apps from iTunes onto phone?
Also I assume it will not revert back to v3.12 but leave v4 in tact??