i wanted to upgrade my ios coz most of the apps are not supporting my present version . my present version is 6.0.1
i m using r-sim . it is not specifed for a particular carrier i can use any carrier network with this r-sim
i heard that if i update my phone through software update from itunes directly my phone gets locked and it goes into black list
how to update my phone .
please let me know how can i upgrade my ios