Only one as of now, AT&T.
The Iphone is nationally supported at AT&T and Verizon. Although it is not recognized by cell phone companys you can have your Iphone unlocked so it will work on any GSM network globally.
Verizon wireless and at&t
Sprint and Cricket are two known companies to have unlimited data usage for the iphone
i know for sure that att has the iPhone and i believe that Verizon is about to begin selling them.
an iPhone can not be used to provide internet access to the PS2
In the continental US AT&T has sole exclusivity as the carrier for iPhone through 2011.
AT&T, Verizon, and Sprint.
provide some good names of galvanized companies
There are a wide range of companies that provide permanent health insurance. An example of companies that provide this cover are Permanent Health Company and Just Permanent.
Companies like BlackRock provide model portfolios. AAII, Couch Potato Portfolios, BMO ETF, and MorningStar are companies that also provide model portfolios.
No other phone companies other than at&t will have the iPhone but you can buy the iPhone from at&t with the no commitment price, and then take that phone to an other carrier (like Verizon or tmobile) The no commitment price is a lot more expensive though, and there is many phones available that are similar to the iPhone, so be careful of what you buy.
Some names of the companies that provide online flight booking are Southwest, Kayak, Orbitz, and Expedia. These are the best companies that provide online booking.