I have an Samsung BlackJack II that i'm using with tmobile and I want to be able to connect with the internet and download emails. but i get error messages. Is not having this service the reason why (I already have it configured to tmobile at least I think so)? Let say I do get this service and I got on the internet on my phone, used Instant messaging, Live Maps or any other internet application will it bump my bill up because of of all the data I'M using?