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No. Sandbox testing numbers use the Free number tier, which has a 0-credit online session-day rate.
The available number count depends on the project. Open the Console or call GET /v1/sessions?projectId={projectId} and select rows with testMode: true.
POST /v1/sessions/testing supports US, GB, BR, and IN. The country defaults to US.
No. The public API does not provide a Sandbox message-send endpoint.
Sandbox message history is not available through the public API.
In Inspector, choose Open beside a testing number. Inspector reserves the number for your device and opens the session. See Claims and devices.
Choose Release on the original device, then choose Open on the new device. Refresh Inspector if the number does not appear immediately.
The Free number tier provides 5 messages per second and 0.25 GB of included data per testing number. See Sandbox limits.