Originally Posted by JimD
If one uses this app to connect a laptop onto the AT&T network, will a charge of some fee for tethering appear on the bill or is this invisible to them?
Just keep your data usage under 5 GB a month and you should be fine.
The iPhone data plan is unlimited. However, some people say there is a soft 5GB cap. Meaning your account may be flagged if you exceed that amount. The reason for this is that it is uncommon to go over 5GB a month on a mobile device with WiFi capabilities, unless you are tethering.
If you are tethering and you go over 5 GB, AT&T might hit you with large data charges, although I've never heard of that actually happening to anyone. They can tell what browser you are using and if it's not a mobile version, they know you're tethering and there are no tethering plans at this time.