If you've purchased a subscription to Premium, this is valid across all of your devices sharing the same Apple ID.
Say you purchased on your iPhone, but features are still locked on your iPad, you need to RESTORE PURCHASES on your iPad.
To Restore Purchases
- Go to the Premium page in the PolyNome menu
- Tap the big blue button at the bottom ("Try It Free" or "Continue")
- Tap "Restore Purchases"