# Tempnumber – Cal.com booking page

> Using Temporary Numbers for SMS Testing

A Free Number can be useful for testing websites and mobile applications that rely on text messages. Instead of using a personal phone, a tester can use a Temporary Number to check whether signup forms, verification steps, and notifications work correctly.

For example, a Temp Number can help developers test whether a confirmation code arrives after registration and whether the website processes it properly. A Temporary SMS Number can also be used when testing several signup scenarios without connecting the process to a personal phone.

Services that provide Receive SMS Online or Receive SMS Free options can make basic testing more convenient. A tester may use Temp SMS to check whether an application sends the expected message after an action, such as creating an account or requesting a password reset.

A personal number is generally intended for everyday communication, while a temporary option is designed for short-term or testing purposes. SMS Free services may have limitations, so their suitability depends on the website, application, and type of message being tested.


Receive SMS Online
Temporary Number
Temp SMS
SMS Free

Booking page: https://cal.com/tempnumber

## Event types

No public event types.

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=<event type id>&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

Each event type's `.md` document lists its required booking fields and the `POST https://api.cal.com/v2/bookings` request (`cal-api-version: 2026-02-25`).

## More

- API docs: https://cal.com/docs/api-reference/v2/introduction