Can I put a sim card from one carrier into an unlocked phone from a different carrier?
Hi yes you can freely use your sim in another phone which is unlocked from different carrier .But you must check that whether that phone is unlocked from CDMA network and if you want to use GSM sim in it then you cant .Phone unlocked from CDMA network can be used with any CDMA network after unlocking and not with GSM vise versa for phone unlocked from GSM network .If you want to unlock your phone from GSM network provider .Then visit WickedUnlock.com here they render unlock code for all mobile models .Once you unlocked your mobile then it will be free to any GSM sim in it in all countries.
Theoretically yes but you should make sure the unlocked phone you are transferring your SIM card into also supports the same cellular providers operating frequency. Its like this, every GSM cellular service provider operates in one or two of these possible frequencies 850/900/1800/1900 MHz. This will depends on the carrier and the country in which service provider operates, its usually 850/1900 in North America and 900/1800 in Europe and Asia. Most of the phones sold in the USA/Canada work in the North American frequency and not in other, so make sure your new unlocked phone works in the particular frequency for your provider.
