Germany → Mongolia
Germany plugs
Type C
Type FMongolia plugs
Type CType FShared plug types: C, F
Compatibility: Compatible
Voltage — Germany 230V — Mongolia 230V
Voltage is the same. Your devices should work normally.
Device compatibility (phones)
Phones almost always support 100–240V, so yours should work safely. Check your charger label to confirm.
You likely only need a plug adapter (if socket shapes differ). Voltage is close between these countries.