Wanted to upgrade my 3GS ,4.1(IOS) with jailbreaked already to latest version

[iMore Question]

Hi ,

I am using the 3GS , 4.1 IOS , Jailbreaked longtime back and orignally bought in Tokyo with locked version.
I jailbread longtime to unlocked phone which is in current IOS as 4.1 and wanted to upgrade to latest or supported IOS in to my 3GS without losing my call avaliability.

I know this can be done by through installing I tunes latest version but risk of possility to loss call facility

Pl shelp

 

[jsntrenkler]

Hello welcome to iMore, a member with more experience with this will respond to this thread, while you wait please consider taking a look at our Jailbreaking forums located at Jailbreaking, Unlocking, Hacks, Themes & Mods - iPhone, iPad, iPod Forums at iMore.com Again welcome to iMore