sappy_junior728 How is jmp.chat better than Google Voice?
I never used google voice,i think you need to give a real number to set it up but pretty sure they will need gplay services for notifications.
Been using 2 numbers with jmp.chat for long time,they dont need play services for notifications and are open source. calls are very reliable that i ported my primary number to it and got a data only sim from them. I keep my phone in Airplane mode almost all the time with wifi on and use the mobile data when i go outside.
I barely use normal calls nowadays so this was not an issue for me, i made my friends to use signal/whatsapp by saying them i have a very limited talk time and cant speak much on a normal call and forced to use signal/whatsapp and nowadays no one calls me on my number, i just have it for booking some reservations or something but everyone cases may vary.
Been seeing more and more banking apps are using sim binding to use their apps so you may need to keep the real sim for that purpose, at least in the US that's not a thing yet or my banks haven't implemented it.