Well, to be honest I had no idea that cheap phones like that existed.
Besides costs though the main reason I dont decide to get a phone is just due to all the data collection they do, plus nearly every service and government/housing/job related thing connected to me uses the family phone #, switching them over would take hours if not days of calling, settings editing or paperwork to do.
I already pay for my family’s house, food and utilities so I don’t really see why its an issue to borrow the family’s # every now and then.