Iphone 4 unlocked for tmobile?

I have an iphone 4 unlocked for Tmobile. I currently have ios 6.0.1. I have an update to get ios 6.1.3. Remember i do have my phone unlocked for tmobile. If i update will i lose my unlocked? If i do update what will happen overall? And etc

I have the same iPhone 4 unlocked with tmoble but i have ios 6.1.3 and I've updated it and nothing's happened it still stays at tmoble and you just get the update

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