AT&T’s just announced plans to bring out their mobile hotspot app to coincide with the launch of their first 4G phone, the HTC Inspire 4G. Folks will have to pay $20 for the privilege, but there are a couple of interesting perks that go along with this. The hotspot plan comes with an extra 2GB worth of data that can be combined with your current data plan. Essentially, you’d be paying $45 for a 4GB data plan that you can use to surf on your phone or tether to a WiFi-enabled device. ($25 for 2GB plus $20 for mobile hotspot and 2GB.) Make more sense of it if you’re still confused at AT&T’s site.