CAn i update my iphone 4s to ios 7? - 1

I have a sprint iphone 4s and i unlocked it using R sim 7.
can i update my iphone to ios7 and have no problem with activation after update
and would R sim 7 support ios7?
i really need help

No not R sim… Just leave it as it is get connected to Wi-Fi then go to settings>updates>iOS 7> agree to the terms it'll take about 30 minutes if you have good Wi-Fi.

If you did not go through the carrier to unlock the phone that is a jailbreak. If you try to update odds are it will go into recovery mode forcing you to restore and losing your jailbreak.