abcZ without a cellular connection, its a paperweight. Kinda pointless to have a phone that cant... Phone.
As I posted elsewhere, you can easily make phone calls without cell connection, by using a VOIP app and connecting to the network over wifi.
I have done so for years. The main difference is that you cannot be reached at your phone number without a wifi or other net connection. If your phone is for your convenience and not for others to spam and bug/interrupt you, that might even be a feature :-)