The credit card mobile phones now provided on some aircraft, do not interfere with aircraft systems because they are wired to a special "base station" that has been designed to safely receive and transmit radio signals in the aircraft.
credit card mobile phones are turned off in emergencies
( z1 turn-off :ARG1 ( z2 phone :ARG1-of ( z3 mobile ) :instrument ( z4 card :mod ( z5 credit ) ) ) :time ( z6 emergency ) )