Auto-renewal failed on iOS: how do I renew my number?

A failed auto-renewal means Apple was unable to charge the amount for your subscription (expired card, insufficient funds, etc.).

To avoid losing your number, you need to cancel your subscription on Apple's side, then complete the payment manually directly from the Onoff app.

Step 1: Cancel the Apple auto-renewal
Open the Settings app on your iPhone.
Tap your name (at the very top of the screen).
Tap Subscriptions.
Select the Onoff subscription and cancel it.

Step 2: Renew your number manually
Once the cancellation is confirmed on Apple's side, open your Onoff app.
Go to your number's settings (or tap the number if it shows as expired) and follow the steps to complete the manual payment.