VTB Mobile steers roaming using the A1S Multi IMSI solution

VTB Mobile, the mobile virtual operator that operates in Russia, and A1 Systems company have deployed and launched A1S Multi IMSI – the roaming steering solution. The implementation project took less than one month.

The largest international roaming hubs and major international and local mobile network operators have a vast number of roaming agreements with other operators all over the world. Thus, they process an enormous voice and data traffic and have the best price for it. Collaboration with such companies allows MVNOs to get a huge roaming coverage and the best price for it.

The A1S Multi IMSI solution helps MVNOs to integrate with their roaming partners, and thus quickly provide the best roaming coverage and prices to their own subscribers.

A1S Multi IMSI is a special microprogram, also named as an applet, that resides on SIM cards or eSIM chips. After registering in a roaming network, the A1S Multi IMSI applet is triggered. Depending on the current roaming network, the applet selects one of the IMSIs from its own memory and replaces MVNO’s IMSI with a selected roaming IMSI. In a home MVNO’s network, the process goes backwards.

In most cases, changing IMSI is invisible for subscribers. Changing IMSI does not effect on MSISDN, so a subscriber can make and receive calls without any limitations.

The A1S Multi IMSI applet is compatible with SIM cards of all major vendors.

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