The latest scam is to convince the phone company to transfer your mobile phone number to a new SIM. Cloud Hopper is the app that does this. Once that's accomplished, the bad guys can gain control of all your apps, including banking apps with 2 factor authentication through a SIMJACKED phone. That's what happened to Twitter founder Jack Dorsey. Leo says that what he recommends is contacting your mobile service and request they use a PIN to verify it's you when seeking to get a new SIM.