I recently sold my 2G and got a 3G which has v4.1(8b117) software and 05.14.02 firmware.
I did not need to unlock this phone as my carrier (O2 UK) is an official iPhone carrier so my SIMM worked OK but I wanted to jailbreak it to install some Cydia apps as I had done on my 2G.
So I used the 4.1(3G) iPhone 1,2_4.1_8B117_Restore.ipsw and RedSn0w and the jail-breaking was successful but since then the phone seems very slow in all operations and I have to re-charge the battery nearly every day.
I have turned OFF the following unless needed:
I know there is an issue with v4.1 and battery drain with unlocked phones but my phone is NOT carrier unlocked only jail-broken.
How can I address the slowness and battery drain problem.