Android only, and data only – no voice!
Invisv is a clever way of making sure that nobody can associate your phone with its activities. It does this my letting all the users share IMSIs, rotating through them. This is not too different to how VPNs are private, or how people can, for example, share a service using the same subscription (like a library card).
Read all about it at Wired
The thing is, it is not needed. When you use a HotSpot on your main phone, the IMSI data is not used. Couple that with a VPN and a phone with no SIM card, and you can more easily have untraceable online activities – just with the need to carry two phones.
