I am using T-mobile right now and I have not activated any data plan in my t-mobile because I am not interested in getting one. Now I am planning to buy any android Smartphone just to use the standard phone function. I have googled and found that Motorola droid is a good phone but is mainly offered by Verizon. So I want to know that can I use my t-mobile sim card in it just to make calls and any other data will be through wifi.