Using a telephone, by means of a telephone.

(rare) Contactable by telephone.

plural of telephoning

Talking to someone using a telephone; Synonym of on the phone / (dated, UK) Connected to a telephone system.

(humorous) A tendency to use the telephone excessively.

The sequence of digits used to identify a particular destination telephone in a network. / (in the plural, humorous) A large number.

cell phone (US)/mobile phone, mobile (UK)

A conference held by telephone. An arranged phone call between more than two parties. / (by extension) Any multi-party telephone call.

A listing of telephone subscribers in a specific geographical area, together with their telephone numbers and, sometimes, a street address.

any equipment that establishes connections between telephones / the rooms housing such equipment