If you already have F-Secure Mobile Security Premium and want to upgrade to F-Secure Mobile Security Premium Plus, you will need to cancel your F-Secure Mobile Security Premium subscription first, then upgrade to Premium Plus.
Because your F-Secure Mobile Security payment is controlled by Apple, you will need to cancel your subscription through your iTunes account. Here's how:
- Open the Settings app on your device
- Tap on your AppleID
- Tap Subscriptions
- Select F-Secure Mobile Security
- Tap Cancel Subscription
Once your subscription expires, you can choose to upgrade to Premium Plus from within the F-Secure Mobile Security app.