I use MagicJack . I’ve been using it since around 2011. I had the app on my tablet. When that broke I called MagicJack and they switched it to my iPhone. I receive calls. I don’t understand why you don’t hear it ring or it’s not connected to your cell. I pay around $50 cad a year. Unlimited. I use it a lot.
There is a text option also but I’m not interested in that. I have messenger or WhatsApp. I found Skype to be inferior to MagicJack.