<P> Other providers use Multi-IMSI technology to lower the cost of roaming . In this case there is a program on the SIM card that selects the lowest cost IMSI (or' profile') to use in a specific country . For example, Cloud9 Mobile make use of this technology . </P> <P> Increasingly, data services are being added to roaming SIM cards to reduce the cost of roaming data charges . Mobile users are increasingly using data services and it can be very difficult to predict the cost of using data because it is invoiced based on volume . </P> <P> This technology is also used in a number of machine to machine applications where devices communicate with one another, such as vehicle tracking systems . By switching between multiple networks, more complete network coverage is obtained and costs are minimised through least - cost routing . </P> <P> For some applications (particularly where regular travel between two countries is the main purpose) a Dual SIM can be considered as an alternative . They have the advantage that it is possible to buy a local SIM card and use that next to the primary SIM card . </P>

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