This number calls my home phone number at least once a day and has been doing so for six months or so. There is no one on the line that responds. When I call the number back, there is a voice recording, then a message that 'the number you have dialed is not in service.'
This number (March of Dimes) calls EVERYDAY!!! Pick up phone and I hang up right away hoping they would think phone number is not good but keeps calling. My block feature on my phone is full, maxed out at 250 blocked numbers.