Area code 771

Why does DC need a different area code?

There are 700,000 people in DC. Not all of them are of the age to own their own cell phone. If there's a landline in a house, it would cover several people.

But even if every single one of those 700,000 people were of the age to have their own cell phone or other devices ... each person could have 14 devices with its own phone number before we would run out

How many individual business numbers are there? Why not make the businesses use the 771 and give people the 202?