Can I call friend who does not have CoverMe?

It’s completely true though it’s our expectation that everyone can use CoverMe to protect themselves from any possible risk in terms of telecommunication.
A CoverMe phone number is able to reach both landline and mobile. Therefore, if the calling target doesn’t use CoverMe, the call can be still made. Moreover, the calling is totally secure due to a specialized tunnel created by CoverMe so that the overall communication between you and the other will be perfectly protected from prying eyes. In addition, all your phone calls and SMS records based on CoverMe app will never be tracked by anyone.