To check service availability, go to the service status page. There you can see if there are any current issues and you can subscribe to updates, so you're always informed about the API's uptime and downtime.
The API is designed to validate one phone number at a time.
If you enter multiple phone numbers when you submit a request:
Only the last number in the list will be validated, provided the data format is application/json or application/x-msgpack.
Only the first number in the list will be validated, provided the data format is application/xml.