Well at that point I'm guessing you buy a few $25 backup phones that you leave turned off in your bag. Also in that cash free society, which will probably not

Well at that point I'm guessing you buy a few $25 backup phones that you leave turned off in your bag. Also in that cash free society, which will probably not have phone numbers anymore, adding a few more phones that you never use will probably be free or $1/month. Or maybe cell phone networks will turn into something equivalent to wifi, that you could pick and choose from a software menu.