MJ in my eyes is a alt option
When I'm traveling I have my mobile but also my MJ or some other VOIP to keep the costs down. If someone needs to call me, they can always get me on my mobile. But I do have the more affordable route.
I got Vonage in my Polish address and so far after 4 year never had a problem. That IS my landline there.
In the USA I also got a VOIP over Comcast as a landline. Neither place has a hard line landline anymore.