Predam iPhones are iPhones that are released. If you already have an iPhone, there are ways to unlock it with AT & T or T-Mobile. But if you have not already, you can buy a pre-owned iPhoto that was already open.
iPhone is a great technology, but at present Apple is only available on the AT & T GSM network. This may change in the future, but you must either sign up for a two-year contract with AT & T or purchase a Predam iPhone with you, which is released so that T-Mobile, the other large GSM carrier the United States.
Another advantage of buying a Predam iPhone is that it will work on any GSM carrier in the world. True, if iPhone has not yet been put into your country, you can purchase a locked Predam iPhone, insert a GSM SIM card, and start talking.
However, purchasing the Predam iPhone is not so unthinkable. For one, Visual Voicemail will not work unless it is on AT & T's network. However, this is expected, as one of the features of the AT & T network is that no one else has it now. This was also a problem that YouTube was blocked as long as it was activated, but the software used to unlock has greatly improved since the first changes and now YouTube works like a charm.
The iPhone is great and everyone has one. Maybe one day Apple arrives and starts selling them on the street without a contract. Until then, you can buy a Predam iPhone online that works with your chosen GSM service provider.