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By the GSM iphone 5 you can unlock it easily by the network provider or a relevant software or by an onlione vendor like ClassicUnlocking.com easily .By an unlocked GSM iphone you can use any other GSM network in other country.It is more suitable for roaming to other country.But the CDMA iphone 5 ,you can't change the network provider easily.
Really the only difference I notice from a end user standpoint is that the removable SIM card on GSM phones allows switching phones on a carrier by doing little more than switching SIM cards. Most of the rest of the world outside the US uses the GSM standard, so if you are a traveler, there is a real advantage there. I actually keep a spare GSM phone around even though my carrier is Sprint, which is a CDMA carrier. When I travel to Europe, I just buy a SIM card from a pre-pay carrier in whatever country I'm in, and I have a phone that will work during the trip for very little expense.