What it is
A new backend-to-backend API that performs an HLR (Home Location Register) lookup for a given phone number to determine reachability and product coverage. Given a phone number, the API call returns information about the mobile carrier, country and which IDlayr atomic APIs (e.g., PhoneCheck, SIMCheck, etc) are supported for that number — enabling you to know in advance whether our network-based flows will work for that subscriber.
Why it matters
- Pre-flight coverage: lets you decide whether to proceed with PhoneCheck / SIMCheck or return an
mno-not-supportedoutcome earlier in the flow, avoiding unnecessary work. - Better routing and UX: by identifying carrier / coverage up-front you can reduce failed attempts and choose the most appropriate authentication path
- Note: the lookup is a network call and can add latency and cost, so treat it as a pre-check rather than a replacement for other faster client-side signals.
- Consistent naming: this capability is exposed as Coverage by Phone Number (aka “Coverage / HLR” or “Reachability by Phone Number”) across the product.
Docs and Endpoint
Full reference and request/response details are available in the docs: