Complementary to the Matrix SIM SwitchBox - MSSB - QUALIGON developed and launched the QUALIGON Virtual SIM Switch - QVSS -, a distributed SIM multiplexer. QVSS allows remote sharing and switching of SIMs, e.g. SIMs with special profiles, and mobiles. With QVSS you can use SIMs and mobiles more efficiently. Roaming testing is also supported. The number of SIMs and mobiles to be combined with each other is fully scalable. SIMs and mobiles are connected to a QUALIGON Box placeable at different locations and interconnected via IP. QVSS is controllable via web interface and REST API.