libphonenumber/resources/metadata/372/altformats.csv

1	Format	Parent Format	Comment
2	6 XXX XXX	all_3/4	There are about 2 million search results for numbers written with the 6 separate.
3	[4-79]X XX XXX	all_3/4	Some prefixes have been seen in this format too.
4	[4-79]X XXX XX	all_3/4