> ## Documentation Index
> Fetch the complete documentation index at: https://docs.polymorfa.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sandbox

> Questions about testing numbers, claims, and Sandbox limits.

<AccordionGroup>
  <Accordion title="Does Sandbox consume session-day credits?">
    No. Sandbox testing numbers use the Free number tier, which has a 0-credit
    online session-day rate.
  </Accordion>

  <Accordion title="How many testing numbers do I get?">
    The available number count depends on the project. Open the Console or call
    `GET /v1/sessions?projectId={projectId}` and select rows with `testMode: true`.
  </Accordion>

  <Accordion title="Which number formats can I create?">
    `POST /v1/sessions/testing` supports `US`, `GB`, `BR`, and `IN`. The country
    defaults to `US`.
  </Accordion>

  <Accordion title="Can I send messages through the API?">
    No. The public API does not provide a Sandbox message-send endpoint.
  </Accordion>

  <Accordion title="How do I read received messages?">
    Sandbox message history is not available through the public API.
  </Accordion>

  <Accordion title="How does the desktop app claim a number?">
    In Inspector, choose **Open** beside a testing number. Inspector reserves the
    number for your device and opens the session. See [Claims and
    devices](/sandbox/claims-and-devices).
  </Accordion>

  <Accordion title="How do I move a testing session to another device?">
    Choose **Release** on the original device, then choose **Open** on the new
    device. Refresh Inspector if the number does not appear immediately.
  </Accordion>

  <Accordion title="What limits apply to Sandbox?">
    The Free number tier provides 5 messages per second and 0.25 GB of included
    data per testing number. See [Sandbox limits](/sandbox/tiers).
  </Accordion>
</AccordionGroup>