Also on this changeset
https://www.openstreetmap.org/changeset/164923466

I see the problem now.
On the Foodmaker website they have a problem with their database and empty values are printed as a weird "0000000" character string.
https://foodmaker.be/v4/?pagina=fmRestaurants&accept=all

My request to you (and your other team members) is the following.
If you see such weird values, please ignore them and do not import those non-existing phone numbers into OSM.

Apart from that, thanks for the good work you are doing.