Even the best ZTE modem unlock tool will fail in these scenarios:
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For many older 3G and some 4G models, you can find online calculators or software that generates an unlock code based on your IMEI. Once you insert a "non-accepted" SIM card, the modem's web interface (usually at 192.168.0.1 192.168.1.1 ) will prompt you for this code. DC-Unlocker: zte modem unlock tool