I need expertise help with Iphone 3 GS update .
I am currently on IOS 4.1 & Firmware : 06.15.00
Its O2 lock phone & last time i had updated had to go online & purchase for a unlock of the phone.
Now i need your help with what IOS i should update too ?
Would that update break my unlock ? (Most Important)
Can it be jailbreaken later ?
Please provide me some guide or instructions .
Cant download any new applications because of this old IOS :(
Thanks & Regards