I purchased a new mobile phone and moved my sim card to it, so that I can use the T-Mobile service I am paying for, with the new phone.
But I still have my old mobile phone (Moto G3), now without any sort of carrier, service, or phone number that would allow me to make or receive calls on it.
What I am looking for is an Android app/service that would give that phone a new life, with a new number and allow making/receiving real phone calls over wifi only, without the need for the phone to be attached to a traditional non-wifi carrier. It would be used for US calls, only, no international usage.
What I don't want is a service that will require me to pay per minute or buy an allotment of minutes in advance, or require me to view ads or complete offers to earn credits that can be spent to make/receive calls. (I don't have time for that nonsense). I also am not looking for texting, video calls, text chatting, or any other frills (if the service comes with it, fine, but I don't need it and won't use it). I just need voice calling. I also don't want something that would require others to have and use the same app, in order to "call" me. (there's no shortage of apps that can do that, including Facebook, Skype, and a bunch of others) I also do not want ads on my lock screen or unexpected ad popups.
I don't mind paying a cheap fee, around $20 to $30 per year, but am against paying anything much more than that, as I don't expect to use it very much.
Basically, I am looking to turn the old phone into something that has a phone number that only works at home or if I am somewhere where I can connect to some sort of wifi, including free wifi.
Google Voice is out, since your phone has to have an existing phone number to set it up on your phone, and all incoming calls would get forwarded to that number, rather than to my currently numberless phone, and all outgoing calls would require an existing carrier to provide the voice minutes that would be used. Since this phone is no longer connected to a traditional carrier, I can't do that.