Check your 3G / 4G modem. If it is in stick mode then use the Huawei terminal to transfer modem into modem mode by a AT ^ SETPORT = "FF; 1" or the command AT ^ U2DIAG = 0. Modem in HiLink mode does not respond to AT commands, no modem can be found , no SMS can be sent.
Disabling HiLink mode and transfer of 3/4G-modem to mode "modem only".
The very first thing to do - to disable a request / check the pin code in the modem software. After that you need to get a SIM card from the modem and all subsequent actions be made without a SIM card.
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