Use a reputable ZTE unlock service or calculator by providing your IMEI and phone model.
For repair shops or advanced users, hardware like the or Z3X ZTE Tool can read the 16-digit code directly from the phone’s firmware. However, these boxes cost $100–$200 and require technical knowledge (installing drivers, booting the phone into EDL mode). Zte 16 Digit Unlock Code Calculator
Power off your phone and insert a SIM card from a different carrier. Use a reputable ZTE unlock service or calculator
A quick YouTube search for "ZTE 16 digit unlock code calculator" returns thousands of videos. These almost always follow the same script: Power off your phone and insert a SIM
In the US and EU, unlocking does not void the warranty. However, if you damage the phone by entering the wrong code 10 times or using malware-infected "calculators," that damage is not covered.