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.
Mobile phones must always be in airplane mode on aircraft.
( z1 obligate :ARG2 ( z2 mode :mod ( z3 airplane ) :domain ( z4 phone :ARG1-of ( z5 mobile ) ) :time ( z6 always ) :location ( z7 aircraft ) ) )