The device with the T-Mobile SIM card has not connected to the network. Went to the T-Mobile store and the technician checked the device ID, the system replied that it is not supported. T Mobile recently upgraded its network to 5G, many old non-T Mobile branded devices are dead as a brick.
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π Juiced Systems Silver BizHUB USB-C Multiport Gigabit HDMI Hub with 3 USB 3.0 Ports, Gigabit Ethernet, 4K HDMI, SD/Micro SD, and USB-C Power Delivery
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π StarTech.com NETRS232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (Black)
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