Using verizon jetpack then received data notice?

Just yesterday a friend and I signed with verizon and I decided to get the jetpack seeing as I don't have Wi-Fi in my apt but she does. My phone said it was connected and I spent maybe an hour on pandora and occasional Internet browse. Then today around 6 o'clock we received a notice that'd we hit 50%. We're doing a 4 gb plan. So that's 2 gb in like 18 hours! When we were both supposedly using Wi-Fi. How is this even possible? Even if we hadnt been using Wi-Fi, it wouldn't have used this much. I have the iPhone 4 which I used to have a year ago as well, and almost never went over 2 gigs in 30 days. What am I missing?

When you plug your Jetpack into an outlet to recharge, make SURE that it is turned off. Also, make sure your phone is not picking the Jetpack over the Wi-Fi access. On my iPhone under Settings, it shows the name of the Wi-Fi I'm currently using and it's not the Jetpack.

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