After testing with SIM cards, the device shows network initialization but cannot make or receive calls or SMS. The SIM is detected only after opening the phone app, and behavior varies depending on whether a PIN is set.
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✅ All current T68 firmware versions support LTE data transmission only —
❌ Voice calling (CS/VoLTE) and SMS functions are not supported at the hardware level.
The LTE module provides 4G internet access only, enabling data connectivity and VoIP (Voice over Internet Protocol) via supported apps. It is not a telephony-capable module in the traditional sense.
In short:
“It’s not telephone over LTE — it’s internet over LTE.”