Dota 2 players who want to play in ranked games will have to offer up an extra bit of information in order to be able to participate. With the launch of the new matchmaking update, players will now be required to register a phone number.
The purpose of this change is to help prevent the issue of players creating multiple accounts in order to game the matchmaking system and make it harder for players to keep ‘smurf’ accounts. Preventing smurfing is a rather important issue for the company because this behavior not only makes newbie experiences… well… suck, but also results in the selling of boosted accounts.
As of now, registering the phone number is still optional, but after May 4 it will be mandatory.
Of course, the phone number linking isn’t the only thing that changed in this update. To see the full list of changes, check out the post on the Dota 2 blog.