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All these days lots of type of wireless communication, digital gadgets is already on the big market. It is really amazing, all kinds and different styles and colors of cell phone with a high technology adaptation at top brands of gsm cell phones. GSM cell phones are designed to work with any service provider. In theory, all you need to do is swap the SIM account card in the phone. But some service providers 'lock' the phone they sell you.

Many mobile network operators lock a mobile phone to their network, ensuring you can't just up and leave them whenever you feel like it. They do this by locking your phone's SIM to the phone itself, so no other SIM will work in it. But what if you do want to switch networks? What if you want to leave your old contract and go to a shiny new (and cheaper!) operator, or just switch SIMs to use a local operator's network when you travel abroad?

Phones are naturally unlocked

When originally manufactured, all GSM cell phones are unlocked. That is, they can be used with any SIM from any cellphone service provider - always assuming, of course, that the cellphone service provider has compatible GSM service on the same frequency bands that the phone can operate on. Most cell phone service providers electronically 'lock' the phone so that it can only be used with their service. There are obvious reasons why they choose to do this - in particular, to force you to pay what are usually very high roaming charges when you take your phone out of their network and use it elsewhere in the world.

Fortunately, this locking is reversible. With some phones, it is possible to simply enter an unlocking password code into the phone and it is immediately then unlocked. Other phones need to be connected up to a special unlocking data terminal.

What is GSM? Is it different than normal cell phone service? How do I know if I have GSM or not?

GSM is a type of digital mobile phone service. The more common type of digital mobile phone service in the US is CDMA, but just about every other country in the world uses primarily or only GSM. For you as the user of your phone, there is no difference at all between using a phone on a CDMA system or a phone on a GSM system. Unfortunately, the two different systems are not compatible with each other.

Today, cell phones are made more innovative by applying technologically advanced applications such as GPS or Global Positioning System. Equipped with this remarkable device, cell phones can now operate beyond their basic functions. With the GPS system, cell phones can be used as a tracking device that enables people find the right places or even hunt down a relative or friend on his exact location.

GPS or Global Positioning System is a device used to pin down people's specific location anywhere on earth. The central hub of the system depends on '24 satellites' that move around the earth two times a day. The identification of certain locations was made possible using fully operational devices that includes a series of receivers and satellites.

Some cell phones are already unlocked and some are not when you buy it from the stores. You don't have to worry if your mobile phones are unlocked many site offer you a free tips how to unlocked it and you can also buy a new mobile phones for some stores who offer unlocked cell phones.