Information about iPhone 3gs with t-mobile

Okay I currently have an iPhone 3gs but the ios is still 3.1 and I want to update it to the latest version 6.1 but I'm not sure if it will work with t-mobile because I heard that it will make it locked or something. I can't download any apps that have an ios of 3.2 or higher. I really want to update it but I'm afraid to mess it up or unlock it. Can I update the ios using a t-mobile sim or will it mess up? I really need further information please and thank you so much.

Click on settings. General. The software update. It will tell you what updates are available. It should work with t mobile. They have no reason to lock it.

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