Roaming Mobile Calls
The use of roaming SIM cards in its most common form is in normal voice applications such as mobile phone calls. The common application of Roaming SIMs for voice is where mobile calls are automatically routed to, and made on a least cost network. This typically means that incoming calls are free, no matter which network a mobile user is on. This also means that a caller enjoys the lowest cost when making a call, significantly reducing call costs, especially compared to normal network charges for International Roaming.
Global roaming SIMs are very often combined with callback technology, whereby the user dials a number in the normal way, but the call is intercepted by an application on the SIM card and turned from an outbound call to an inbound call which the user answers. This is to take advantage of the fact that inbound call charges are typically lower than outbound ones. Telecom North America is one of the providers in the US using this technology.
Some providers achieve this automatic call interception and callback by encoding a program onto the Sim card. For example BackChat Mobile in Australia utilises this method to intercept the call and send a network command to trigger the callback.
Increasingly, data services are being added to roaming SIM cards to reduce the cost of roaming data charges. Mobile users are increaslingly using data services and it can be very difficult to predict the cost of using data because it is invoiced based on volume.
Read more about this topic: Roaming SIM
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