We set a default rate limit for requests that requires a message to be sent via SMS or WhatsApp. The default limitation can be seen in the image below, and can be updated in the Dashboard under Rules.
The above rate limit rule means that within the last 5 minutes:
there can be at most 10 requests with the same IP address as the current request
there can be at most 5 requests with the same phone number as the current request
there can be at most 5 requests with the same Session ID as the current request
Identifier Max: 5 requests - Let's say you have made a request with phone number
+12345678910 5 times within the last 5 minutes. The sixth time you make a request with phone number
+12345678910 within that 5 minutes, it will be blocked. However, once 5 minutes has passed since your first request, you can make a request with phone number
Session ID Max: 5 requests - If you make 3 requests with phone number
+11111111111 and 2 requests with phone number
+3333333333, and then make a request with phone number
+55555555555within 5 minutes, all in the same browser, then the last request will be blocked. This is because your Session ID is the same for all 6 requests.