Be careful canceling your data plan for the iPad when you aren't using it may have to be done periodically not just once until you want it again. Here is our story...
My wife purchased an iPad 2 with 3G capabilities from a Verizon store with the promise that she could discontinue the data plan at any time because it had a month to month plan. We used it for 1 month and decided the data plan was not particularly useful for us at the time because of the performance and the fact that we have data plans already on our phones, so we cancelled the plan online.
Then later data plan charges for the iPad start appearing on our bill without us starting it. Customer service states that is says that the service will start automatically after a period of inactivity. We never saw that stated on the website. We decide it is not worth the service and decide we want to take our iPad totally off.
We called customer service to disconnect the iPad from Verizon and the representatives tell us we have to go to the store to cancel. We go to the store and they say we have to call customer service. We call customer service and they won't disconnect our iPad. We ask if there is some way we can cancel it on their website and they say no. My wife is literally going around in circles with the service representatives for hours being bounced from representative to representative. One representative even yelled at her why did she buy a 3G enabled iPad if she didn't want the service. Since she is at work doing this she has to give up and call on multiple different days. She finally gets a representative that admits that it will get counted against him if he disconnects the iPad. The representatives are told to try and talk the customer out of it and if they can't it goes against their record, but he finally agrees to "take the hit."
She then asks to get the charges reversed. The representative says he cannot do that. She asks to speak to his supervisor, who also refuses. She asks if at least the charges for the months she spent trying to get the iPad disconnected to be reversed. Again the supervisor refuses. Are you kinding?! Our family's bill with Verizon is almost $400 per month and they are willing to upset us because they won't handle this mysterious data plan start-up and the charges while we are on record as trying to disconnect the iPad?
I hope there is some way to resolve this. We like Verizon's coverage, but are willing to move to one of the much cheaper provider's in our area if this is how they treat loyal customers. I guess Verizon doesn't really want our $4800/year because they need us to spend more to be worth their trouble.