Moon,
But at first all T-mobile people were saying that you need to have the data plan 24.99 or 34.99, so the phone can work properly, it does not have anything to be with the phone the data plan, so if you want to use applications that you use internet, sure that you need the data plan or if you want to check emails, etc, unless you just use WIFI.
The problem here is when you set your phone to default, it asks for login / password from your gmail account, right? I know that pressing menu it will pop up some options, is there anyway that we can connect thorugh WIFI from there? if so, then for nothing we don't need the data plan for sure or the other option is to ask the sim of someone (friend or family) just to bypass that and then use your own sim without data plan

Any clue about this?