The ZTE Z6252ca wasn't broken. It was legally locked to its original carrier. In many markets, carriers subsidize the cost of phones like the Z6252ca (a basic 4G LTE feature phone) in exchange for a service commitment. The lock ensures you don't buy the phone at a discount and immediately take it to a competitor. However, regulations have shifted. In Canada, the Wireless Code has mandated that all devices sold after December 1, 2017, must be unlocked free of charge upon request. In the US, similar rules (FCC requirements under the 2021 "Unlocking the Box" initiative) require carriers to unlock devices once paid off or contract terms are met.
The ZTE Z6252ca is a basic but capable device. Unlocking it legally restores your right to choose your network—just follow the proper channel, and avoid sketchy "free unlock" software that often carries malware. Zte Z6252ca Network Unlock
Maria had a problem. Her reliable, no-frills ZTE Z6252ca—a rugged flip-style phone she used for work—was refusing to accept her new SIM card. She had just switched from a regional carrier, Cancom Wireless , to a larger national provider offering better rural coverage. The phone powered on, displayed "Invalid SIM," and asked for a "Network Unlock Code" (NCK). The ZTE Z6252ca wasn't broken