Ok first of all i'd like to apologize for posting (probably) silly questions but i never had a android smartphone before. 1. what is 3G? is it needed? i heard it drains battery loads. 2. What is "data roaming" and "data trafic"? when i try to enable either of these it says "additional charges may apply depending on your network subscription". are these needed? i am currently on pay as you go. 3. In the location and security settings, what is "use wireless networks" and "use GPS satalites" when i try to enable these it says data transmision charges may apply. 4. Does being connected to the internet in our home use credit? I don't want to use mobile internet, just want to connect to my router. Bearing in mind i'm only going to be connected to the internet at my house, browsing, downloading apps, checking email, calling, texting, maybe facebook...I just don't want to run up unessessary costs without even knowing.