There are hundreds of websites that function as "tools." You enter your IMEI, pay a fee (usually $10–$30), and they email you the code.
: Many "free" tools found on unverified forums may contain malware or "backdoors" that compromise the user's computer or data traffic. zte modem unlock tool
This is a two-in-one tool that writes generic firmware first, then removes the lock. There are hundreds of websites that function as "tools
Insert a "foreign" SIM card and connect the modem to your PC. The modem dashboard (usually at 192.168.1.1 pay a fee (usually $10–$30)
This is a community-developed tool specifically for older Qualcomm-based modems (MF190, MF180, K3565, etc.).