For many years third world countries had terrible phone networks. Though this is still the case in many places things are improving thanks to satellite communication.
Vodafone
When you get a new phone go into a network store and get the networks sim for your phone.
Credo Company is the worst phone company in the world, while Nokia is the best phone company in the world going by the ratings given by the users.
Verizon Wireless is the largest cellular phone network in North America.
Look at your phone bill
The NOKIA 1100!!
eBay
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Naturally it boils down to personal tastes but the worst show [read least entertaining] on the now defunct network was perhaps the The Aquabats Super Show.
Whichever network your phone is connected to !
It is generally possible to get a phone on the Three network in the United Kingdom, as the phone provider is located out of the United Kingdom themselves.
Yes, the iPhone is indeed a phone and as with any other cell phone it needs a network to call and text. The iPhone is on AT&T, the phone network that works with the iPhone. The iPhone currently does not have any other network/cell provider.