You can swipe down the screen once you've opened the Reminder app. It's the same as we refresh other apps like calendar, contacts, or gallery. But, if you want to delete your Reminders on your iPhone, then follow the below steps: Step 1. Open the Reminder app. Step 2. Click on the Edit. It'll show you all the Reminders. Step 3. To delete the Reminder, click the minus button. Step 4. Select the Delete option to complete the process.