When you sign up for WiFi on the Go, you will receive either an Alcatel Linkzone 2, or a Franklin T9. The Samsung Galaxy A52 and A32 and the iPhone 12 mini ConnectEDge phones all have 5G support. 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:

Alcatel Linkzone 2

Franklin T9