The need to allow customers to roam on other provider's networks has long been a challenge for mobile operators, and the requirements of mobile location services only make it more difficult. It is important to understand how roaming for voice services works, because roaming for mobile location services will be similar but more complex.

To allow roaming for voice services in a postpay system, a mobile operator needs to have network elements of its roaming partners updated in the regions in which the subscriber wishes to travel. The network elements detail the subscriber's mobile number and authorization for roaming services and provide the means for authenticating the subscriber. When a subscriber makes or takes a call while roaming, the ...

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