Smartphone Questions? Ask A Smartphone Technician for Answers
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That could mean that the issue is with your Apple iTunes acoc**t or the payment method. I suggest you follow this official guide for inapp purchases - https://support.apple.com/en-ca/HT202023
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Seems like an issue with the app causing that error and the phone freezing. I suggest you to uninstall the app and then re-install it again