[[:Category:en:Area codes]]

I disagree. And I stand by my comment that if you are going to remove the categories, you should then immediately add them to the data module. Otherwise, you're just pedantically orphaning a category.

Manually adding categories is a useful stopgap for (the vast majority of) people who don't mess with data modules. And, IMO, it's ridiculous to base categorization on something that few people other than you can understand.

Well, are you going to add it to the data module or are you just going to leave it orphaned?

Why don't you do it yourself?

Because I don't know how nor do I see any particular need to have it done. You're the one complaining about how I had it AND you're the person who always codes that stuff.