hey guys i bought new iphone 3g and unlcoked it.. i am using t-mobile and i have t-mobile data plan $24.99( which was $19.99 before) .. i get E symbol on iphone and i set APN to internet2.tmobile.com i didn;t set username and password. but when i open safari or appstore or youtube it says can;t connect.. pls help what i have to do