I live in a 2G area so I use a 2G sim with 2G internet pack in my Samsung galaxy tab that uses Mobile network for internrt connection. Don't know anything about wifi. Considering getting a plug in wifi data card for better connection. Tell me about the payment option. Do I have to pay for data usage the way I do evety month n wifi both.if I use wifi do I have to pay for it? If so how? Plz help me. Thank you. Hope to hear from you soon.