When you sign up for WiFi on the Go, you will receive either an Alcatel Linkzone 2, or a Franklin T9. Each device has slightly different specs, however as they connect to the T-Mobile cellular network, the speed is determined by the network itself as well as your coverage at the time.
From T-Mobile:
4G LTE Network (On-Device):
- Download speeds: Typically between 9 – 47 Mbps, with minimum expected speeds of less than 0.1 Mbps
- Upload speeds: Typically between 4 – 20 Mbps, with minimum expected speeds of less than 0.1 Mbps
- Latency: Typically between 30 – 50 ms
4G LTE Network (Via Smartphone Mobile HotSpot/Tethering, for Plans Including 4G LTE Tethering):
- Download Speed: Typically between 5 – 31 Mbps, with minimum expected speeds of less than 0.1 Mbps
- Upload Speed: Typically between 3 – 15 Mbps, with minimum expected speeds of less than 0.1 Mbps
- Latency: Typically between 30 – 50 ms
Device specs can be found here: