You may need to restart the iPhone once to get calls to work, but activation is usually immediate after speaking with AT&T customer service. Yes you can use data by following the steps above. (I tried it today and it worked, on an iPhone 4 ofcourse)

Perhaps the best thing about going with Three, though, is that if you've got a 4G device you'll pay the same as you do for 3G.O2 iPhone SIM only customers also quality for some great benefits, such as money-off incentives and priority booking for events at O2 venues.

Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising. You might also want to consider the provider, and which mobile network that provider uses. If you’re living in a more regional or remote area, you’ll want to ensure you’ll have network coverage where you live and in any other areas you frequently visit. The search results do not include all providers or products, and may not compare all features relevant to you. Note: Some users say this requires a jailbreak and others have been able to get it working without one, here’s how to jailbreak iOS 4.2.1 with Greenpois0n RC if you require a jailbreak. How to Enable Data & Internet on a Pay-Go iPhone 4Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn. That's only half of what makes them so appealing, though. People also love the flexibility that an iPhone SIM only plan offers.

Provide the old pay-go sim card ICCID number and the new micro sim ICCID (from the new iPhone 4 About Screen or iTunes)If you don't need an unlimited data plan but still want great service and all the features, buying data in bulk from Mint Mobile can save you money. And you'll have use of T-mobile's nationwide network to use it! Best International: Straight Talk When choosing a PAYG plan, there are a few things you’ll want to keep in mind. Firstly, you’ll want to set a budget, and also consider how long you want the plan to run for. Once you have a clearer idea of how much you’re looking to spend, you’ll want to compare plans around this price point. The biggest benefit of using your older iPhone with a prepaid or pay-as-you-go cellular service is that there are no long-term contracts. You can activate the phone for one month at a time. This is ideal if you're traveling overseas and want to use the iPhone with a local phone number and not pay a fortune in international roaming charges, or if you want to give your kids the older iPhone and provide them with cellular service in the United States without making a long-term financial commitment. Don’t have an iPhone 4? No problem, setup an iPhone 3G or 3GS as a pre-paid iPhone, it’s even easier since you can just swap sim cards directly! A bonus to the GoPhone plan is that I could text unlimitedly to Canada, so I could keep in touch with people at home without additional costs to me!