| > | | | | Quad-band: |
| Overview | | | | Quad band phones will work all over the world with all |
| GSM: The term used for Global System for Mobile | | | | GSM service providers. |
| Communication. It is a worldwide accepted cellular | | | | Frequency Operation Mode: 850 MHz, 900 MHz, 1800 |
| network standard which uses a SIM (Subscriber | | | | MHz and 1900 MHz. |
| Identification Module) card to make and receive calls | | | | Countries: Europe, Africa, Asia, United States, Australia, |
| and data over the network. The SIM card holds the | | | | New Zealand, South America and almost all the |
| phone number assigned by the service provider, your | | | | countries. |
| phonebook and other registration information. GSM | | | | If you are purchasing a Cell Phone check the above |
| standard is used by approximately 213 countries with | | | | frequency band and make sure that the cell phone |
| over 3 billion people. GSM network uses four | | | | band is supported in the country. United States support |
| frequency range 850 MHz, 900 MHz, 1800 MHz and | | | | 850 MHz and 1900 MHz frequency band. Majority of |
| 1900 MHz. | | | | carriers in US such as T-Mobile, Cingular uses 1900 |
| Dual-band: | | | | MHz frequency and in some state Cingular uses |
| These phones will work around the world but not in | | | | 850MHz frequency band. |
| United States and Canada. | | | | What is Unlocked GSM Cell Phones? |
| Frequency Operation Mode: 900 MHz and 1800 MHz. | | | | Most cell phones service provider companies such as |
| Countries: Europe, Africa, Asia, Australia, New Zealand | | | | T-Mobile, Cingular etc provide cell phones to users |
| and much of South America. | | | | which are network locked. This means that, the |
| Tri-band: | | | | phones can only be worked with their company's |
| These phones will work around the world including | | | | network.For example, a locked phone from T-mobile |
| United States and Canada but will not work with the | | | | wouldn't work with Cingular's service. So if you want |
| service provider that only supports 850 MHz | | | | to use your cell phone anywhere in the world with any |
| frequency. | | | | service provider you have to purchase unlocked cell |
| Frequency Operation Mode: 900 MHz, 1800 MHz and | | | | phones which are not Network Locked by any service |
| 1900 MHz. | | | | provider and you have to just transfer your existing |
| Countries: Europe, Africa, Asia, nearly all of United | | | | SIM card into your new unlocked phone and your |
| States, Australia and New Zealand. | | | | phone is all set to make and receive calls. |