the iPhone will be available sometime near july 2010, AT&T contract ends around there. ( i dont know exactly when)
you can do what is called"unlocking" your iPhone, but seeing as most all of those are unstable and cause service failure and you must completely restart your phone to restart the signal, u wont even know its gone, it will appear to say you still have signal.
also apple has lawsuits out for (10) different patents that may have been violated by 3 different companies providing similar phone operating systems and graphic interface. Google Andriod is one of them, sorry i do not have the link to the news topic i was reading that from. i only mention this because if u were thinking of getting one of those phones or products from the companies in question u may b in for a dissapointment if Apples Lawsuit goes through.
If your trying to jailbreak your iPhone and you have updated to the latest version which is 3.1.3, do not do so yet, for currently there are no working breaks yet, there are alot of scam sites giving u the hack for 3.1.2 and that will not work, and there making you pay for it, and then keep your money because they legally fulfilled there weak contract of providing you with a hack, but it wasnt specfic, and then they say they will hold onto your money and give you the 3.1.3 hack when its available but by then there long gone.
Just some F.Y.I, hope it helps