Tello

An MVNO (mobile virtual network operator) sells mobile service without owning cellular infrastructure. MVNOs like Tello lease access to major carrier networks in the United States and deliver coverage using those host networks.

Tello uses T-Mobile for coverage in the United States.

MVNO coverage mirrors the host networks it uses. Compare the host carrier performance above to see how those networks perform in the United States.

Use the coverage maps above to explore real-time coverage by host network. Each map reflects the underlying carrier used by Tello.

The performance metrics summarize median download speed, upload speed, and latency from crowdsourced tests on the host networks listed above. Higher download/upload and lower latency indicate a faster, more responsive connection.

The reliability score summarizes how dependable mobile performance is in the United States. It uses a 0.0 to 10.0 scale (higher is better) and is calculated from real-world speed test percentiles with weighted components: download (50%), latency (30%), and upload (20%). It evaluates the lower-end experience using the bottom 10%, 5%, and 1% percentiles when enough samples are available. If local speed testing is limited, a coverage-based fallback is used from signal quality distribution (great/good/poor).

Coverage maps are built from crowdsourced tests, so areas with limited recent data can look incomplete. Coverage improves as more tests are collected.