The call quality and Internet connectivity are two things to compare on unlocked cell phones.
Cell phones come in two types: locked and unlocked. You can use unlocked phones on multiple carriers, while locked phones are limited to one carrier. There are several ways to compare unlocked cell phones, including by the network type, cost to buy, and international calling costs.
Cellular Carrier Network Type
Cell phones run on two major types of networks: GSM and CDMA. An unlocked GSM cell phone can work on any other GSM network but will not be compatible with any CDMA network. Similarly, CDMA phones will work with any other CDMA provider but not with any GSM network.
Price
You will pay full retail price for an unlocked cell phone. Compare how much you will need to spend to purchase the phones you consider. For example, the Nokia E71 can cost as much as $310.81 while the Nokia E63 costs $209.10.
International Calling Costs
Unlocked GSM cell phones can make cheap international calls while traveling abroad, while CDMA phones are subject to expensive roaming charges. Because you can interchange SIM cards in unlocked GSM phones, you can purchase a prepaid international card in the country you are visiting instead of being tied to the roaming charges of the American SIM card.
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