> For the complete documentation index, see [llms.txt](https://docs.idlayr.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.idlayr.com/products/risk/sim-swap/testing.md).

# Testing in sandbox

{% hint style="info" %}
**Backend API** · GA
{% endhint %}

Test SIM Swap without real MNO traffic by using a sandbox project. The last digits of the `phone_number` drive the simulated outcome — every response path can be exercised without contacting a real carrier.

See [Project modes](/get-started/concepts/project-modes.md) for the general sandbox model.

## How sandbox testing works

In sandbox mode, IDlayr intercepts the request and returns a simulated result based on the MSISDN suffix. The shape of the response is the same as production — same fields, same error codes — so your integration code doesn't need to branch on environment.

## MSISDN suffix map

| MSISDN ends with | `no_sim_change` | `status`    |
| ---------------- | --------------- | ----------- |
| `0`–`4`          | `true`          | `COMPLETED` |
| `5`–`9`          | `false`         | `COMPLETED` |
| `00`, `55`, `99` | —               | `ERROR`     |

For the cross-product overview of sandbox — what's simulated, what isn't, sandbox retention — see [Sandbox testing](/get-started/sandbox-testing.md).

## What sandbox doesn't simulate

* Real MNO query latency and variance.
* Operator-specific behaviour in SIM-change semantics (some operators only report changes within a fixed window; sandbox returns synthetic data not subject to that).
* Prepaid-line edge cases that some operators handle differently.

Run a small set of production checks against real numbers in your target markets before going live.


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