> For the complete documentation index, see [llms.txt](https://docs.spike.sh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.spike.sh/alerts/sms.md).

# SMS

Spike sends an SMS when an incident triggers.

<figure><img src="/files/YUMH3K2E1yk6BKG4yEkD" alt="SMS alerts from Spike"><figcaption><p>SMS alerts from Spike.</p></figcaption></figure>

## Change incident status via SMS

You can acknowledge or resolve an incident by sending an SMS from your registered phone number. Send a new message (not a reply) with the incident ID:

1. **#\<incident\_id> ack** to acknowledge (example: `#1226 ack`)
2. **#\<incident\_id> res** to resolve (example: `#2071 res`)

Check if your country or region supports SMS on the [geo permissions page](https://app.spike.sh/geo-permissions).