I have a wi/3g. I have not turned on the 3g yet nor have I bought the 3g data plan from at&t yet. My question: I use wifi only but some places that I will travel to on occasions I will need the a 3g data plan. Can I buy a 3g data plan say for a month then drop it and if so how would I go about dropping the plan? I know I can turn off the 3g on my ipad but how would I stop the billing? I don't want to have to call at&t. I try not to call at&t if I can help it. Thanks for any information!!!