German phrase
Ich rufe Sie um ~ zurück.
Meaning
I'll call you back at ___
When to use it
A polite call-back promise. Often used to confirm a time in phone conversations.
Example dialogue
Ich rufe Sie um 16 Uhr zurück.
I'll call you back at 4 p.m.
Das passt mir, danke.
That works for me, thank you.