German phrase
Ich melde mich wieder.
Meaning
I'll get back to you
When to use it
You will contact them again. It can sound formal after checking something or preparing information.
Example dialogue
Ich prüfe das kurz. Ich melde mich wieder.
I'll check that quickly. I'll get back to you.
Vielen Dank, das wäre sehr hilfreich.
Thank you very much, that would be very helpful.