Definition of cell phone noun from the Oxford Advanced Learner's Dictionary

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cell phone

noun
ˈselfəʊn
 
; ˈselfoʊn
 
(also cellular phone, informal cell) (especially North American English) (British English usually mobile phone, mobile)
 
a telephone that does not have wires and works by radio, that you can carry with you and use anywhere
cell phone usersI talked to her on my cell phone.The use of cellular phones is not permitted on most aircraft.
Usage noteUsage note: PhonesMaking and receiving phone callsthe phone/telephone ringsanswer/pick up/hang up the phone/telephonelift/pick up/hold/replace the receiverdial a (phone/extension/wrong) number/an area codecall somebody/talk (to somebody)/speak (to somebody) on the phone/telephone; from home/work/the officemake/get/receive a phone calltake the phone off the hook (= remove the receiver so that the phone does not ring)the line is (British English) engaged/(especially North American English) busythe phones have been (North American English) ringing off the hook (= ringing frequently)put somebody through/get through to the person you want to speak toput somebody on hold (= so that they must wait for the person they want to speak to)call from/use a landlineMobile/cell phonesbe/talk on a (both British English) mobile phone/mobile/(especially North American English) cell phone/(informal, especially North American English) celluse/answer/call (somebody on)/get a message on your mobile phone/mobile/cell phone/cellswitch/turn on/off your mobile phone/mobile/cell phone/cellcharge/recharge your mobile phone/mobile/cell phone/cella mobile/cell phone is on/is off/rings/goes off(British English) top up your mobile (phone)send/receive a text (message)/an SMS (message)/a faxinsert/remove/change a SIM card