In PUBG Mobile, you can create a character with various methods including Guest, Google (Game Center for iOS), Facebook, Twitter, etc. and play the game.
If you linked your previous device with your social media account and played the game, you can sign-in your existing character by linking your new device with the same social media account.
However, please be noted that Android and iOS support different OS respectively. Android devices use "Google Play" platform, and iOS devices use "Game Center" platform.
If you cannot remember the account information you linked with, please contact the following support centers of social media services.
[Go to Google Play Support Center]
https://support.google.com/googleplay/?hl=ko#topic=3364260
[Go to Facebook Support Center]
https://ko-kr.facebook.com/help/
[Go to Twitter Support Center]
https://help.twitter.com/ko
[Go to Apple Support Center]
https://getsupport.apple.com/?caller=home&PRKEYS=
If you linked your previous device with your social media account and played the game, you can sign-in your existing character by linking your new device with the same social media account.
However, please be noted that Android and iOS support different OS respectively. Android devices use "Google Play" platform, and iOS devices use "Game Center" platform.
If you cannot remember the account information you linked with, please contact the following support centers of social media services.
[Go to Google Play Support Center]
https://support.google.com/googleplay/?hl=ko#topic=3364260
[Go to Facebook Support Center]
https://ko-kr.facebook.com/help/
[Go to Twitter Support Center]
https://help.twitter.com/ko
[Go to Apple Support Center]
https://getsupport.apple.com/?caller=home&PRKEYS=