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Step 1: Check device configuration

  1. Enable cellular data
  2. Set network to 3G/LTE or 4G/LTE only (first registration requires at least 3G)
  3. Enable roaming
  4. Set APN: Name: Telnyx APN: data00.telnyx (leave all other fields blank)
  5. Update firmware, then reboot
Android: Settings → Mobile Networks → Access Point Names → Add iOS: Settings → Cellular → Mobile Data → APN

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Step 2: Check connectivity logs

View logs via portal (click SIM ICCID → Connectivity Logs) or API: 
GET /sim_cards/{id}/wireless_connectivity_logs
The type column shows Registration or Data. MCC identifies the country, MNC identifies the carrier.

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Step 3: Diagnose patterns

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No connectivity logs at all

  • Connection isn’t reaching Telnyx. Device may be on a network Telnyx can’t access, misconfigured, or SIM is deactivated.
  • Fix: Scan networks and manually select one. Verify device config (Step 1). Check SIM status in portal — may be disabled due to data limit or billing.

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Multiple registration attempts, no data

  • SIM isn’t authenticating.
  • Fix: Enable data roaming. Verify APN is data00.telnyx.

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Registration succeeds but no data sessions

  • Data sessions not being created.
  • Fix: Enable data roaming. Verify APN is data00.telnyx.
If issues persist, contact support via the Mission Control Portal.