By default, SIMs get dynamic private IPs — reachable outbound only. A public static IP makes the SIM reachable from the internet ($3/mo per SIM).Documentation Index
Fetch the complete documentation index at: https://developers.telnyx.com/llms.txt
Use this file to discover all available pages before exploring further.
Actions
| Action | Endpoint |
|---|---|
| Get Public IP | GET /sim_cards/{id}/public_ip |
| Set Public IP | POST /sim_cards/{id}/actions/set_public_ip |
| Remove Public IP | POST /sim_cards/{id}/actions/remove_public_ip |
| Bulk Set Public IPs | POST /sim_cards/actions/bulk_set_public_ips |
When to Use
- Inbound access — connect to your SIM from anywhere (SSH, remote management, server-initiated requests)
- Firewall allowlists — stable IP for access control rules
- Device-as-server — run services on the device that external systems call into