Sandbox limits

Free number-tier limits

Capability	Value
Online session-day rate	0 credits
Throughput per testing number	5 messages/second
Included data per testing number	1 GB
Real-number registration	Not available
Campaigns	Not available
Inbound-call allowance	5/month
Outbound-call allowance	5/month
Serverless-call allowance	1,000/month
Testing numbers per project	5, or 50 with the Simulation add-on

Sandbox is intended for development and functional testing. It does not send messages to real WhatsApp recipients.

Pool size and session availability depend on the project. List the project sessions or refresh Inspector instead of hard-coding a number count.

Number pool

List and add testing numbers.

Open a testing session as a linked device.

Billing modes, add-ons, and number tiers for real numbers.

Create, list, and remove a testing number.