A mobile network API lets an application request a defined capability from a network provider, such as checking a phone-number association. A usable integration needs more than an endpoint: the right operator coverage, approved purpose, authorization flow, version, and behavior when the service cannot answer. Evaluate those dependencies before making the capability essential to a customer journey.
Choose an operation with a precise meaning
Start with a product question: “Does the supplied phone number match the number associated with this authenticated mobile context?” That is narrower than “Is this a trustworthy customer?” The distinction determines what the result can contribute to your application.
The CAMARA Number Verification r3.2 release publishes API version 2.1.0. Its versioned API definition includes a verification operation returning a Boolean match result. This guide pins that version for its teaching example; a provider may expose a different supported version or profile.
A match describes a number association in the authenticated context. Your application still needs its own account policy, transaction checks, and recovery path. Treat the API response as one specifically defined input to that decision. The historical ambition of mobile web services—making network capabilities available to software—becomes useful when each operation has a bounded, testable meaning.
Map the application, user, and provider separately
Write down who calls whom: the user starts a task, your application arranges the provider's authorization process, your backend invokes the operation with an appropriate token, and your application interprets the response. Keep provider credentials on the appropriate trusted backend and keep them out of public example files.
CAMARA's versioned access and consent guidance distinguishes authorization flows and the declared purpose for accessing data. Agree the purpose, scopes, user notices, and applicable consent handling with the provider during onboarding. A successful client login alone does not establish permission for every operation or subscriber.
For Number Verification 2.1.0, the specification requires a user-associated, three-legged token and describes network-based authentication as well as a temporary operator-token route. The connection requirement depends on the selected route: the flow without that temporary token requires a mobile-network connection; the temporary-token route can support other connections. Verify the provider's implemented flow, including dual-SIM and Wi-Fi behavior, rather than relying on the word “silent.”
Commercial onboarding is a separate check. For example, the Vonage Network Registry documentation describes business/application profiles, country and feature selection, operator review, and test-number access. Its workflow illustrates why a public specification alone cannot establish availability for your intended users.
Read a simulated verification exchange
Download the original offline response fixtures to test how your own decision logic distinguishes a match, a mismatch, and an unavailable result. They contain synthetic data and application-level expectations, with no credentials or live service URL.
Keep mismatch and inability to check separate
| Observed outcome | Interpretation | Next action to design |
|---|---|---|
| Successful response, true | The documented number comparison matched. | Continue the account policy using that specific evidence. |
| Successful response, false | The comparison did not match. | Offer a correction or approved alternative; preserve the distinction. |
| Authorization or permission error | The requested check was not completed. | Inspect the flow, token scope, purpose, and provider error contract. |
| Timeout or unavailable service | No usable comparison result was obtained. | Apply a bounded retry or fallback policy; do not invent a match result. |
Specify timeout and retry limits before the pilot. Follow the provider's rate-limit and retry instructions, including any delay supplied with an error. Record a correlation identifier, timestamps, version, and outcome category while minimizing sensitive data in logs. A fallback should tell the user what to do next without exposing backend details.
Make the pilot answer a coverage question
- Record the exact API version, provider, operator/country coverage, and approved purpose.
- Verify the selected authentication flow on supported devices and connection types.
- Exercise synthetic success, mismatch, permission, timeout, and malformed-response cases before live testing.
- Use authorized test subscriptions and the provider's sandbox or test-access process; document how it differs from production.
- Measure the fraction of intended journeys that obtain a usable result, and inspect the fallback experience for the rest.
Save those findings with dates and provider documentation. A pilot succeeds when both the supported path and the unresolved path behave as intended. For repeatable scenario design, use phone interruption and recovery tests; for a different kind of telephony integration, see the TAPI guide.