SIM Free phones are GSM handsets sold without the line or SIM card. These phones are not affiliated to any particular network but acts as one when you put in a SIM card of any network. The Subscriber Identity Module or SIM cards are detachable smart card that carries all subscription information of a mobile phone connection.
SIM free mobile phones can be used to log in to any compatible network. They are generally brand-new, have never been locked and do not have any network markings and will take any GSM SIM card . Though a Contract phone with preset module seems like a hassle free option, the SIM free mobile phones have many advantages working for them.
For people in Pay As You Go packages and those who don't want to change their existing plan, SIM free phones are the most easiest and hassle free option. If you want an upgrade the mobile phone you're using, all you have to do is get a SIM free phone and put his existing SIM in the handset. The handset being pre-designed to support dual, tri or quad band GSM networks, becomes active as soon as you put the card inside.
Another great advantage of SIM free phones is the flexibility it offers to its users. Supposedly, if you have a dual band phone, you can change your handset instantly in case you're traveling to a country that doesn't support dual network. Alternatively, you can change your existing SIM with one from the country you're traveling and escape the exorbitant rates of international roaming charges.
The fact that all mobile phone manufacturers of the world produces SIM free phone is the icing on the cake. Be it a Nokia, Sony Ericsson, Motorola, LG or Samsung handset, you'll always find its SIM free version. SIM free phones don't tie you down to any kind of commitments and gives you a free hand while selecting your handset model, network and tariff plan.
Source: http://EzineArticles.com/?expert=Keith_Rickwood
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