PICK UP
stop talking on the phone
connect one caller to another
answer a call, lift the receiver to take a call
SWITCH OFF / TURN OFF
put the receiver down
to be connected to someone on the phone
deactivate (a mobile phone)
SPEAK UP
HOLD ON / HANG ON
return someone’s call
GET OFF (THE PHONE)
HANG UP
CALL BACK / GET BACK TO (SOMEONE)
talk louder
wait
GET THROUGH
PUT (A CALL) THROUGH