There will be a Strict no Cell Phone Policy in Place.
Despite the fact that it is simple to have the wrong impression about this subject matter, there is more to it than meets the eye. When the submarine is in its parked position, non-government electronic devices of any type are prohibited from getting within a set radius around it for reasons relating to safety.
There is a secure container located on the surface of the submarine where crew members can deposit their mobile phones. On ships when they are at sea, passengers are allowed to bring some electronic devices that are not authorised on land or in any other location. As was mentioned earlier, passengers aboard a submarine are not allowed to use cell phones because of the ease with which these electronic devices can be hacked by outside actors.