Roaming for cell phone
The introduction of the digital cell phone system or 2G, which it is more commonly referred to, has given mobile phone users better and clearer voice call quality. As compared to the old analog network which was sensitive to many outside interference, the new one that is based on GSM offers a larger area of scope that connects many users at the same time. Even the newer 3G system has worked on these principals to keep as many users possible under a single network. The system which has been widely used by many operators world wide allowed roaming service possible. Roaming occurs when you go out of your original network (leaving a country or state) and go to an area with a cellular phone network which is compatible to the original. The cell phone automatically searches for a partner network and once connected, you can use the host's facility. For example if you want to make a call when roaming, the call goes to the host network first and then transfers it to your original network for further processing. It is like a credit card is sense where you can use it everywhere it is acceptable. Internal arrangements are made by the networks for them to connect with one another. The cost for calls, messages and information transfer vary for every network provider.
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