0511 87 9898 98 File

If this is a (based on the 0511 area code for Hanover ), the correct formatting would be:

So the cleanest is:

But if you want to keep it readable for local dialing in Germany: 0511 87 9898 98

or 0511 87989898 (as a single block after the area code) If this is a (based on the 0511