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du telefonierst

talk on the phone, make a phone call

→ telefonieren
telefon phone, telephone + ier form a verb meaning “do or cause what the base describes” + st you (singular) present
verb · 2nd-person singular, present tense Rare #41,756
talk on the phone, make a phone call This is the informal singular form used with du.
GE: Du telefonierst mit deiner Schwester.
EN: You’re talking on the phone with your sister.
Conjugation of telefonieren
Indicative present
SingularPlural
First — telefonieren
Second telefonierst telefoniert
Third telefoniert telefonieren

Du telefonierst zu oft.

You spend too much time on the phone.

— One Battle After Another (2025)

Mit wem telefonierst du?

Who are you calling?

— Der große Irrtum (1971)

Hör mal, soll ich jetzt den Müll tragen, und du telefonierst?

Hey, am I supposed to carry the trash while you make a phone call?

— Ghost in The Shell (1995)

Telefonierst du?

Are you on the phone?

Telefonierst du den ganzen Tag?

Are you on the phone all day?

— City of Men (2007)