Now that Phone Verification has been implemented it can be used to solve several issues
If your phone number is linked to all of your accounts and you have to use two-factor login at all times (password + code) this would solve more than Clash smurfing:
- Account Sharing/Hacking would be minimized as whoever is trying to play from your account wouldl need the code from your phone to login
- Smurfing in lower ELO ranked would be entirely impossible since the matchmaker would have access to data from all of your accounts (being in Diamond IV on your main account will automatically bump up your smurf's MMR to at least low Platinum)
- Consistent negative behavior on more than one account could get not only all of your current accounts banned, but your phone number too - rendering you unable to create a new account - unless you link it to a different number (new accounts can be kept locked out of matchmade game modes [or at least ranked ones] and the Hextech Crafting System until they're linked to a phone number)
- Changing the initially linked phone number could be made changeable in two ways - either by paying a very large sum of RP (20K or maybe more) or by sending a ticket to a special section of Riot Games support dealing only with that, but you would have to verify your identity before you're allowed to change the number (that can be an automated system) - this part is to attempt to stop account trading by making accounts extremely expensive, but can potentially be problematic if you have to change your phone number for some reason.
