[Gogar]

You can probably figure that an 'average' picture these days is 1MB, maybe more, maybe less, and an 'average' mp3 or something is 5 MB.

So, if she's checking email a lot, and a friend sends her an email with an mp3 that says "Listen to this!!!" then there's 5Mb. And, you don't get to decide if it was worth it or not until you open the email.


Also, downloading 'apps' for your phone is data, and using the apps is data, too. google, Yelp, restaurant finders, GPS map, anything.