NSDSWebApp. Virtual SIM is an application-enabled service that requires you to install an app to use a number. With this technology, it is possible for one to have numbers of different countries. Non Sim Device Solution (NSDS) is needed for VoLTE and VoWifi (Wifi Calling) if you have a virtual SIM. NSDS allows connecting non sim devices to IMS core: https://uk.linkedin.com/in/hemant-kumar-dewnarain-2b779679
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