"Unlocked" describes cell phones that can use any SIM card, also known as GSM cell phones. Carriers in the United States that use GSM technology are AT&T, Cingular and T Mobile. Any of these unlocked phones will work with AT&T, Cingular and T Mobile.
For those looking for a phone that will work in another country, many other countries use GSM technology exclusively, so these unlocked phones can be used both in the United States and internationally. If you are looking for a phone guaranteed to work with any network in the world, we can recommend the Motorola RAZR. It is a slim phone with all the features that you need (Speakerphone, Bluetooth, Camera) and will work in almost any country.
