TLDR: Thirdfort uses your device's back camera to verify documents and the front camera for a selfie. If either camera is broken, you must use another device to complete the check. Install the app on the new device and sign in with your mobile number if you hadn't already started your check. If you had already started, contact the requesting company to reset access and switch devices once the new text invite arrives.
Broken Camera
If you have been asked to provide your ID, or want to photograph a document to upload as your proof of address or ownership, Thirdfort uses the back camera of your device. The front camera on your device will also be used during the ID task in order to take an image of your face.
If your device's camera is broken or is unable to take a suitable photo for Thirdfort to verify your document, you will be unable to complete your check on that device.
Using another device
If you have access to another device, such as a work phone, or a friend/family member's device, you can instead use this to complete your check.
I've not signed in, how do I use another device?
If you have not signed into the app and started your check yet, you can install Thirdfort directly onto the device you want to use instead from the Apple App Store or Google Play Store. The link in your invite text is not specific to your check.
When signing in, you will be asked for a mobile number. Your mobile number acts as your username, and it does not need to be the same mobile number as the number that belongs to the device you are using. If you are unsure what number to use, use the one that received the invitation text.
I've already signed in, how can I swap to another device?
If you have already signed into the Thirdfort app, your check is now linked to that device and cannot be accessed on another device.
To use another device, please contact the company that requested your Thirdfort check, and they can reset this on your behalf, allowing you to sign in on a new device. You will receive a new text invite on the alternative device once this has been set up by that company.