SIM cards can only correspond to one phone number, and transitively provide guaranteed proof of the identity attempting to login.
With a SIM-verified phone number, you can be sure the person being onboarded is who you expect.
Deploying, maintaining and replacing USB keys, card readers and dongles is expensive. Your users already have their SIM.
Protect your entire workforce, not just at-risk individuals; because malicious actors only need to succeed once.
Many passwordless approaches are simply knowledge factors or shared credentials. Despite this their usability is far from perfect.
Although secure, biometrics such as facial scans are expensive and not accessible to all.
Hardware possession factors like USB keys are both costly to deploy at scale and hated by users — far from ideal.
The humble SIM card has the same cryptographic security as chip & PIN credit cards.
Users can be either silently authenticated, or approve a login request on an app, or scan a QR code with their phone.
Unlike card readers or USB keys, SIM-based verification requires no investment into hardware for your users.
Your users already have their SIM possession factor. All your app needs is tru.ID magic to make use of it.