Can't you just get a plan without data, or just turn off data and wifi? If you are only using your phone for calls and sms, and don't ever turn on your network,

Can't you just get a plan without data, or just turn off data and wifi? If you are only using your phone for calls and sms, and don't ever turn on your network, I'm not sure what security problems you are trying to avoid. Unless you are living under a totalitarian government, this seems excessive to me, but maybe there are other things I'm missing.