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

I

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
 

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