No worries, you can deactivate your old SIM from the Lost SIM screen on the app. You can later request for and activate a new SIM. Follow these simple steps:

  1. Go to more (iOS version) or the sidebar (Android version)
  2. Tap on your profile name and on the next screen select 'MY NUMBER'
  3. Select 'I LOST MY SIM' and enter your password
  4. Select 'DEACTIVATE YOUR SIM' and request a delivery or in store pickup