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In the case of session continuity, seamless access to these services across different access types is provided.

It refers to the mobile phone being used outside the range of its home network and connects to another available cell network.

In more technical terms, roaming refers to the ability for a cellular customer to automatically make and receive voice calls, send and receive data, or access other services, including home data services, when travelling outside the geographical coverage area of the home network, by means of using a visited network.

For example: should a subscriber travel beyond their cell phone company's transmitter range, their cell phone would automatically hop onto another phone company's service, if available.

The home operator then bills these calls to its subscribers and may charge a mark-up/tax applicable locally.