talk on the phone
fixed phr.. A1 Beginner Oxford
fixed phr.. To have a conversation with someone using a telephone.
fixed phr.. To engage in a spoken conversation using a telephone as the medium; a common verb phrase collocation.
I talk on the phone with my mom.
He spent all afternoon talking on the phone instead of doing his homework.
The CEO insisted on talking on the phone to resolve the delicate matter, avoiding the ambiguity of email.
Usage
This common phrase refers to the activity of having a conversation via telephone, whether a mobile or landline.
Teaching tip
Contrast 'talk on the phone' (the activity) with 'call someone' (the action of initiating contact).
Pitfall
She is talking in the phone.She is talking on the phone.The standard preposition for this activity is 'on', referring to the communication channel.