Use existing email for google play account
How to use an existing email when creating a google account to access PSmobile
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Click "Create Account"
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Click "For My Personal Use"
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Enter your name.
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Enter your birthdate and gender and then click "Next"
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Click 'Use your existing email"

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Enter your email address.
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Then check your email and enter the verification code that is sent to you.
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Create a password
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Review your info and then these will be your login credentials for the Google Play Store.
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From there you will re-download PS Mobile.