Can I factory unlock my iphone in the middle of a contract? - 1

I have an AT&T IPhone 4S. I want to factory unlock it using globalunlocks.com but can I do it when I'm in the middle of my contract? Will it damage delete or alter any parts of my phone? (Settings, apps, contacts, etc.) will it do anything to my contract? (Affect any data/messaging, Give me any fees, etc.)

At&t says it will unlock phones after 3 months of usage. You better ask them first.