Will an unlocked iphone 4S work for tmobile if it isn't factory unlocked?

I want to get an iPhone 4S and my friend has the iPhone 4 unlocked but i'm worried that if i get it non-factory unlocked it won't work. My uncle tried to do it a couple of months ago and apple said that if it was factory unlocked every time the phone shut off or died it would reset. I was just wondering if the same thing would happen if it wasn't factory unlocked?

Added (1). So if I get it unlocked everytime it will shut off it will reset? That is what i'm worried about.

I will work but it will keep resetting. I just bought my iPhone from the apple store unlocked and I have tmobile.

It should do if its Un locked?

No that won't happen. Actually the best thing you can do is get it "factory unlocked". Or a permanent unlock where they unlock it via a code that comes from Apple directly, hence the name factory unlock. There's some services that can unlock these iPhone 4S smartphones permanently using a code that comes from a supplier of such codes. It will work for Tmobile. I'm using my Tmobile unlocked iPhone 4S right now as a matter of fact. No matter what, even if it dies or I update the operating system to the latest it will stay unlocked! Try XpressFix or 1 Hour Cell Phone Repair.

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