How can I get my account back (Lost data)??

I HAVE THE SAME PROBLEM

Yes

Before starting the game make sure you have a KONAMI ID so you can transfer your data to any device. If you lost your data you should probably know your account data, if not, it would be hard for KONAMI to find your account. I've done this one time, here's how you do it:

1. Tap the Gear icon on the upper right side of the screen.
2. Tap the "Contact Us"
3. Then tap the "Submit Player Data Recovery Inquiry" button
4. Fill out the form.

As I've said, you should know your account every details but not too much. You should at least know your duelist ID, the last time you played the game, stage you have progressed, and you should show your love to the game by expressing it to them.

I don't know why so many complain without even researching or reading. On any game, you should have back up.

To make sure you will never lose your account, make a KONAMI ID for the sake of you.

Note: They said it took 2 weeks so I've waited that long since it was my fault that my account has lost. Don't blame them for your mistake. IT IS YOUR MISTAKE. LOL

I'm going through this right now too. I had to switch phones and tired to contact via Google Play Games and they were of no help. They gave me an email to contact Konami, so I'm hoping things go well because I've spent at least 120 bucks on this game just due to all of the special sales. Plus all my guys were just at level 30 :( Hoping to get my game back.

So if you delete the app it also deletes ya account?

my account has been overwrite

bullshit game, level 49 and GX 13 ! lot of deck, all chararecters beetween level 20 and 37 !! and now i lost everything !!! fucking shit

I lost all my cards

If you go to the settings in the app you can contact konami and submit a query to get your old account back. You'll need your old duelist ID (the 9 digit number on the home screen), your name, most recent stage, most recent character used, describe your last duel, any receipts from purchases etc... it'll all be on there.

Same thing happened to me, took 6 days to get my account back (missed the whole bakura event, lol). AND WHEN YOU GET IT BACK MAKE A KONAMI ID!

unfortunately, because you didn't set up a Konami account before your phone broke, you no longer have access to your account, it's impossible to get it back now, also it only took me about 1 day to get to stage 30 after accidently losing my original account in a similar accident, so I feels you should be more than capable to catch to where you left off.