You can use any AT&T phone or any unlocked GSM phone that supports AT&T's 850 MHz and 1900 MHz frequencies. That includes smartphones, including the iPhone although some extra effort is required to get data working on AT&T iPhones and getting working MMS (picture messaging) requires jailbreaking.
This is the best current plan for anyone who wants to use an AT&T smartphone on prepaid. Non-smartphone users should stick with AT&T's own $50 prepaid plan includes unlimited data but only for non-smartphones.
The big question about any "Unlimited" plan is what is the data cap? There are no truly unlimited plans especially on prepaid and especially when it comes to data. All carriers except Boost Mobile, which is rumored to be getting a cap soon, have limits on the amount of data you can use, typically 2 GB/month. That's actually quite a bit of data, but it is possible to exceed it particularly if you watch a lot of streaming videos, listen to Internet radio or tether.
The way caps are enforced varies;
- T-Mobile and Virgin Mobile throttle your data to near dialup speeds when the cap is exceeded.
- Simple Mobile cuts off your data for the rest of the month
- Straight Talk cuts your data off permanently
Obviously throttling is better than a temporary or permanent data shut off. H20 is keeping mum about their capping policies so we will have to wait and see what happens.
via: Howard Forums