We have a landline. We don't get any telemarketing or scam calls on the line because we use a call blocker which only allows phone numbers from a whitelist to ring though. It's a magicjack phone line, it costs us something like $20/year.

The number one use for this is because my wife leaves her phone in her purse when she comes home, which she puts down as soon as she gets in, making it impossible for me to contact her when she is home and I am out.

The number two use for this is to find our own cell phones by dialing them when we are out.

And in a very far third place my mom uses it when she comes to visit from overseas (and hasn't gotten a prepaid US sim card).

I'm pretty sure I'm a customer for the echo connect, we use the echo a lot already.