Device registration is a security setting that only lets registered devices into your account. With it on, you have to register again when you switch phones, and even when you reinstall the game on the same phone; that’s why your login gets stuck.

How to register a new device in VAMPIR

  1. Tap Account Security at the bottom left of the start screen.
  2. Read the device registration info and tap Next.
  3. Name the device and tap Confirm. You can’t use the same name for two devices.
  4. Pick your country code, type your phone number without dashes, tap Send Verification Code and enter the code.
  5. If the code is right, you’re done; a registration complete mark shows next to Account Security.
Mobile Phone Verification window during VAMPIR device registration
The phone verification step of device registration. Source: official Netmarble notice.
Source / rights
Image / usage information: © Netmarble Corp. & Netmarble Neo Inc. Image from an official VAMPIR global notice, used for sourced game reporting. · Image source ↗

One phone number can be registered to up to 5 accounts in the same game.

Short answer

Tap Account Security at the bottom left of the start screen, name the device, enter your phone number and the code you get; once it’s registered, the new device can log in. You can remove old devices from the same screen.

Removing an old device and changing your phone number

Manage your devices from Account Security on the start screen, or in game under Options > Account/Terms of Service > Account Security. Delete devices you no longer use with the X next to them; Netmarble recommends clearing old ones. New number? Use Change Verification Information, pass identity verification and enter the new one.

Account Security button under Account/Terms of Service in the VAMPIR Options menu
In game: Options > Account/Terms of Service > Account Security. Source: official Netmarble notice.
Source / rights
Image / usage information: © Netmarble Corp. & Netmarble Neo Inc. Image from an official VAMPIR global notice, used for sourced game reporting. · Image source ↗

Unregister Device turns device registration off completely, but Netmarble warns it leaves your account open to unauthorized logins and item theft.

Why does the Marketplace ask for identity verification?

The first time you use the Marketplace, you register your device and pass identity verification before you can buy or sell. Tap Next on the pop-up, then Identity Verification, and finish the steps. The same check shows up when you change registered device info or turn account protection off.

Source · vampirgb.netmarble.comNetmarble: device registration and identity verification notice

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