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This usually means your in app purchases are disabled in the parental controls for this device. 
  1. From your home screen, tap the Settings app
  2. Tap General
  3. Scroll about halfway down the page and tap Restrictions
  4. Once the passcode is entered, scroll down to the Allowed Content section. Slide the In-App Purchases slider to On 
Alternatively you can purchase monthly and yearly plans through our website without using an In-App Purchase in iTunes. Visit https://www.bitgym.com/profile for details. 

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