It is possible to use the same wallet, with the same wallet address, across devices, by sharing your private key between two or more devices.
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Your Keystore is how you access your unique AppCoins Wallet, so make sure you don't share it with anyone else, storing it in a safe place.
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Having access to your wallet in multiple phones involves 2 steps:
​1st: Backup your wallet in the original device;
2nd: Restore the backup in the new device.
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Both wallets will be functional and you can use them at the same time!