AT+ZIMEI? then AT+ZNLOCK=NCK_code.: Always check if your modem has "unlock attempts" left (usually 10) before starting.
Unlocking T-Mobile 4G Hotspot (ZTE MF61): A case study - Yifan Lu zte modem unlock tool
Most modems come "network-locked," meaning they only work with the provider that sold them to you. By using an unlock tool, you can: : Use local SIMs when traveling abroad. Review: ZTE Modem Unlock Tool
: Users who want a guided, software-based experience without manual code entry. 2. Manual Method: IMEI Code Generation Process: Connect via Putty to COM port