unlocked phones...HELP!?!?

Hi, Im new to the site I have a question :
I currently have a plan w/ t-mobile. I want to keep the plan but the phone is old and I NEED a new one. I want to buy the cingular 8125 PDA phone but they have the worst plans! I know if i buy an unlocked phone I can put my sim card in it but then what? how do i activate it? and also i heard that it damages the phone or the features are deleted... can anyone simplify this?!? Im lost here Thanks for the help

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Actually, once you put in your SIM card you're set. The things that you would just have to do is get the settings for MMS and internet fot T-Zones(since it originally comes with MEdiaNet). Whoever told you that putting in your T-Mobile SIM card would damage the 8125 was probably misinformed. But if you really want this phone, why not just go with T-Mobile's version of the 8125, the MDA? But yeah, just slide in your SIM card, get the settings , and you're set. Feel free to post anymore questions or comments.