Board Thread:Questions and Answers/@comment-26467675-20150605143305/@comment-25971820-20150605143913

If you have your SIF account transfer code/ passcode written down, you could get your account effortlessly by using it on your new phone. If not, i suggest going through the account retrieval process and e-mailing k-lab as early as now.

EDIT: if you play JP Version, you may have linked it with your googleaccount. if so, you can use it to retrieve it once. But if i'm not mistaken, you can re-link it again, do so after retrieving your account.

Also, if you play in iOs, the account is saved in your iCloud. so no worries i guess