Factory unlocked iphone 4s and can i update it?

I bought the iPhone 4s online and i got it factory unlocked, i use it as t-mobile. Everything works perfect except i can't send or receive mms. But thats not the problem. Of course i would love for someone to help out in that situation as well.
But ok. My iPhone is not jailbroken or nothing just factory unlocked and i want the iOS 5.1.1 but I'm scared thats something is going to happen to my phone.
Can i update it without nothing happening to it? Or just leave it like that?

You can update the phone to the latest firmware without any issue. You can jailbreak it and use a third-party app for sending / receiving MMS. Hope this helps.

Yes you can update without any problems.

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