If you are currently on a monthly subscription plan and would like to change to a yearly subscription, please follow these steps:
- Open the Settings app.
- Select the top entry, which is your name, followed by Apple ID, iCloud, iTunes and App Store.
- Tap iTunes & App Store.
- Tap Apple ID: email@example.com
- Tap View Apple ID.
- Tap Subscriptions.
- Scroll to and tap on RoboKiller - Block Spam Calls.
- Tap RoboKiller Yearly Membership.
- Open iTunes on your Mac or PC.
- In the Account menu select View My Account…
- In the Settings section, select Manage next to Subscriptions.
- Select RoboKiller - Block Spam Calls from the list of apps.
- Choose RoboKiller Yearly Membership (1 Year).
- Select Done.