Another idea came to me that would help believers in countries closed to the gospel (Iran, China, North Korea, others) evade government monitoring of phone calls! It is a cell phone app called Red Phone! Red Phone can be installed on any cell phone and it will encrypt cell phone calls to a degree that they are unbreakable. This could be installed on all of the cell phones of members of an underground church and they could be used to safely coordinate activities and also for prayer and fellowship without fear that the government is listening in to bust their operation! This also works for internet access on cell phones and could be used to safely access websites and also downloading apps and also the bible! If you want to have a look at this a PC Mag review of the Red Phone app is here: https://www.pcmag.com/reviews/redphone-for-android