This is to ensure that accounts are valid and belong to actual users.
If you are a buyer, you will not be able to purchase your favourites from Shopee if your number is not verified. We would also like to keep you constantly updated on your purchases.
If you are a seller, you will not be able to list your products on Shopee if your phone number isn't verified.
At the end of the day, we want to create a safe and positive community here at Shopee.