Origin: Greek suffix -phone
Cellphone has 3 different meanings across 1 category:
a hand-held mobile radiotelephone for use in an area divided into small sections, each with its own short-range transmitter/receiver
"He checked his cellphone to see if there was any signal while standing on the edge of the forest."
Alternative form of cell phone
In plain English: A cellphone is a small portable phone that lets you make calls and send texts without needing wires to connect it to an outlet or landline.
"He forgot his cellphone at home, so he couldn't call me while I was driving."
To make a call on a cellphone.
"She quickly moved to the corner to place her cellphone call without being overheard."
In plain English: You cannot use cellphone as a verb because it is only a noun for your mobile phone device.
"I will cellphone you to confirm our meeting time later today."