it's possible to unlock nokia e62?

Yes, is possible. Easy, ask Cingular about...

but i planning to buy it on eBay.... and join to T-mobile 😊

Same thing. Ask Cingular about the unlock of device. After that, is an open device, and you put the SIM you want.

even if i just both the phone from someone and i don't connect to Cingular, it's possible? what they have in this process? what price for this service?
after i will unlock the phone can i put any Sprint sim or T-Mobile and get this carriers internet for pda?

Ask Cingular for price, conditions...

10x

U get the unlocking service from http://www.mobileunlocksolutions.com/..This will help you to unlock your mobile ..