Mobile telephony has seen tremendous growth over the years. From being a communication media of the rich and the privileged mobile phone today has become a part and parcel in everybody's life. Mobile network services has also seen some unprecedented growth. By embracing newer technologies, mobile service providers have been able to cut down the cost and have brought flexibility and afford ability in the mobile communications.Mobile network service providers use various technologies to provide you mobile services. Popular among them are: CDMA and GSM technology. The most widely used is GSM technology around 70 per cent of people across the globe make calls using GSM technology.

SIM free phones refers to mobile phones which are compatible to GSM technology. These phones are available without a connection or a line. You can buy any SIM free phone and use SIM card of any service provider to make and receive calls. A Tri-band SIM Free phone will work on any GSM network service provided you insert a SIM card with a compatible frequency.

As far as advantages of Sim free phones are they offer more benefits than any contract mobile phone and pay-as-you-go phone. A Sim free mobile phone offers flexibility to the mobile users by giving them the freedom to choose service provider. As per his needs and the services of the network, he can switch into any service provider. SIM free phones are ideal for people who travel most of the year. Such people can take any SIM card available in the particular country in order to make and receive calls. Due to such benefits many people are getting hooked to sim free mobile phones. These phones are ringing bells on the sales counter of service providers.

So, if you are using a contract phone and are tired of the services provided by the network service provider then, get a SIM free phone and enjoy the freedom.