> ## Documentation Index > Fetch the complete documentation index at: https://docs.statusstack.com/llms.txt > Use this file to discover all available pages before exploring further. # SMS Integration > Send text message alerts via Twilio ## Overview SMS notifications provide critical alerts directly to mobile phones, perfect for on-call rotations and urgent incidents. *** ## Setup Guide 1. Create account at [https://twilio.com](https://twilio.com) 2. Purchase phone number 3. Get Account SID and Auth Token **Settings** → **Integrations** → **Twilio** ```yaml theme={null} Account SID: AC... Auth Token: *** From Number: +1-555-123-4567 ``` 1. Create notification rule 2. Select **SMS** channel 3. Enter phone numbers (with country code) 4. Set character limit Send test SMS *** ## Phone Number Format **Include country code:** ``` US: +1-555-123-4567 UK: +44-20-1234-5678 International: +[country]-[number] ``` *** ## Message Format SMS messages are concise: ``` StatusStack Alert: Production API is DOWN Status: Critical View: https://stst.co/p/abc123 ``` **Character limit:** 160 characters (standard SMS) *** ## Cost Considerations **SMS charges apply** via Twilio * \~$0.0075 - $0.02 per SMS (US) * Higher rates internationally * Check Twilio pricing **Best practices:** * Use SMS for critical alerts only * Don't send info/degraded alerts via SMS * Consider per-alert cost in high-traffic scenarios *** ## Best Practices * **Critical only:** Reserve for production outages * **On-call rotation:** Integrate with PagerDuty * **Multiple recipients:** Use escalation policies * **Test regularly:** Verify phone numbers are current *** ## Next Steps PagerDuty integration Email notifications