My main phone is a (non-smart) VOIP phone. It gets zero spam. I have a mobile, but it's old, and the battery no longer holds much charge, so despite being mobi

My main phone is a (non-smart) VOIP phone. It gets zero spam. I have a mobile, but it's old, and the battery no longer holds much charge, so despite being mobile, it never moves; it sits on my desk plugged into power. I only have it so I can receive and respond to SMS challenges.