phone UK, informal (to contact someone using the telephone): I’ll phone you later. She phoned you last night, but you were out.
call (to telephone someone): Where are you calling from? Call me seven in the morning.
ring UK spoken (to telephone someone): You can ring me at the office tomorrow.
telephone formal (to contact someone using the telephone): I’ll telephone my colleagues to arrange the meeting.
call up US informal (to telephone someone): We’ll call you up tomorrow morning. Do you want me to call up the doctor?
reach (to contact someone, usually by telephone): You can reach me at this number.
give someone a call spoken (to telephone): Give me a call on my cellphone.