dialing
v. B1 Intermediate US //ˈdaɪəɫɪŋ// di·al·ing
v. to enter a phone number by pressing buttons or turning a wheel to make a call.
v. the present participle of 'dial'; refers to the act of entering a series of digits into a telephone to establish a connection.
She is dialing the emergency number right now.
I spent ten minutes dialing the office, but the line was busy every time I tried.
Usage
Transitive or intransitive; can be used with or without a direct object (the number).
Pitfall
I am dialing to himI am dialing his numberDial is transitive and takes the number or person as a direct object without the preposition 'to'.