She is dialling the phone number.

I prefer using dialling instead of dialing.

I made several diallings to different countries.

She is dialling in to the conference call.

I dialled the wrong number.

She dialled in the correct settings for the conference call.

Decadic dialling was a common method of pulse dialling used in early telephone systems.

Tone dialling is a method of dialling telephone numbers using tones rather than pulses.

Pulse dialling was commonly used in telecommunication systems before the advent of touch-tone dialling.

I picked up the phone, but there was no dialling tone.