> For the complete documentation index, see [llms.txt](https://docs.ilert.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ilert.com/knowledge-base/alerting-and-notifications/which-number-does-ilert-use-for-phone-calls-and-sms.md).

# Which number does ilert use for phone calls and SMS?

ilert uses country specific phone numbers to make phone calls and send SMS messages. Refer to [this page](/alerting/overview/phone-numbers.md#sms-alerts) for a list phone numbers. These numbers can change from time to time. The best way to stay up to date is to install the ilert iOS or Android app and enable our vCard sync feature. It automatically creates an ilert contact with all our numbers and keeps the contact up-to-date.

{% hint style="info" %}
**Related Documentation**

* [Phone Numbers](/alerting/overview/phone-numbers.md)
* [Mobile App](/mobile-app/getting-started-with-ilert-mobile-app.md)
  {% endhint %}


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