I suppose she has a point. Though I doubt any data comes through in Airplane mode, there really is no other way to completely turn off data transmission. If you have your email set only to check manually and you never accidentally hit weather, stocks, email, safari, youtube, or google maps while you're out of wifi range, you should be alright. But that is a lot of ifs.
The real data drain is checking email. Turn that off, and any "unintentional surfing" should cost you at most a couple bucks at the end of the month.
But overall, I'd say she was just trying to milk the $20/mo out of you.
|