Board Thread:Questions and Answers/@comment-25510574-20151102181401/@comment-26432452-20151103010340

As long as you write down your player ID, they probably could doing something for you.

Usually they would ask about who is your leader, what is your main attack party, a couple of names from your friendlist and so on. If you could provide them with all of that, they could give back your old account. (Personal experience, helped a friend of mine to recover his account when he lost his phone)