I have been facing a serious problem for many months. Usually I get a 2-factor authentication code from 51501 when I am supposed to log into Gmail. But for months I am getting a code from a USA-based mobile number: +15155327373. When I call this number, the ring goes on and on and no one picks up, I am facing this problem since October 2015.
There is also a mobile number from Sweden - +46701327805 that sometimes sends the code. I change my passwords every time this happens. What could be the possible reason for this and how to overcome this problem?
By the way,
- I must say I have been hacked for years.
- I don't use VPN; my internet runs off a broadband modem.