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Release notes

Mobile Voice (VoLTE) Now Available in the US

9, Nov 2026

VoLTE calling is now live on Telnyx mobile numbers in the United States. Mobile Voice is in beta while we monitor performance, with worldwide availability to be announced in the coming weeks.

What's new

  • VoLTE calling: Place and receive calls over LTE on any US mobile number with Mobile Voice enabled.
  • Beta status: Provided on a best-effort basis. No SLA applies during beta; the SLA will be defined at general availability.
  • Portal and API control: Enable or disable calls on a single SIM or in bulk across a SIM group. SIMs can be attached to a Mobile Voice Connection via connection_id.
  • Carrier validation: Tested on AT&T, T-Mobile, and Verizon across iPhone 14, 15, and 16; Samsung Galaxy S23, S24, and S26; and Google Pixel devices, including Pixel 6a and 9 Pro XL. Physical SIM and eSIM are both supported.
  • Known limitation (iPhone, USC IMSI): While attached to USC IMSI (IMSI5), iPhones cannot place outbound calls. Set IMSI1 as the default IMSI in the US to mitigate. Android devices are unaffected, and an Apple carrier-bundle update is in progress.
  • Pricing: $5 per month per SIM with no platform fee. Calling is pay as you go, at carrier fee plus SIP trunking rates.

Why it matters

Most IoT deployments run on data-only SIMs, so any device that needs to place a call, from elevator lines to SOS buttons, has meant a second vendor or a legacy carrier contract. Mobile Voice removes that dependency: one SIM, one API, one network for data and voice. Calling rides the same carrier infrastructure as your SIP trunking and messaging, so it behaves like the rest of your communications stack instead of a bolt-on.

Example use cases

  • Elevator and intercom lines where voice availability is a requirement, not an add-on.
  • Fleet and asset trackers with a one-touch SOS button for voice escalation.
  • Consumer and industrial devices that need to place calls, provisioned over the API at fleet scale.

Getting started

  1. In Mission Control, go to Mobile Numbers and select the number you want to enable.
  2. Open the Voice tab and select "Enable calls on mobile number".
  3. For fleet-wide enablement, use the SIM Card Actions API:
curl -X POST https://api.telnyx.com/v2/sim_cards/{id}/actions/enable_voice \
  -H "Authorization: Bearer YOUR_TELNYX_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"connection_id": "your-mobile-voice-connection-id"}'

Learn more in the Mobile Voice pricing and the SIM Card Actions API reference.