said by Chubbysumo:
Skype uses a ton of data, just as much as a call. Calls over att are no longer over a "voice" network, they are just more data in the pot. Smart phone plans on AT&T have NEVER
been unlimited. Read the fine print in your agreement, and it states that the you are on a $30 per month Unlimited* plan. That little asterisk means that there is a catch to unlimited. This catch was a data cap of 5gb per month.
This is simply untrue. The iPhone and smartphone data plans are not capped. They are only capped if you tether.
I challenge you to show me where in the "fine print" it says there is a 5GB cap for non-tethering data access from a smartphone unlimited plan.