Overview
- The companies announced the operational 5G Standalone roaming link on Sept. 21, 2026, confirming validated testing and initial production between T‑Mobile’s and Jio’s cores.
- Syniverse supplied the interoperability platform and Security Edge Protection Proxy (SEPP) that route and secure signaling between the two separate 5G cores.
- T‑Mobile customers with compatible devices can now retain true 5G SA connectivity when roaming on Jio’s network in India, which can deliver faster speeds and lower latency than legacy roaming.
- The firms call the link a technical benchmark that could enable new cross‑network services for consumers, enterprises and IoT use cases, but wider commercial rollouts require more operator agreements and validation.
- Market reaction was muted with only small TMUS share movement, and the milestone builds on T‑Mobile’s 5G SA strategy begun in 2020 while highlighting the industry work still needed to scale international SA roaming.