ZTE Maven 3 Quick Unlock

Just turn on the phone, swap sim cards and enter your unlock code! that's it, no need to setup the Android device, you can do that later, you can even factory reset your phone and it will keep unlocked to be use in any GSM carrier worldwide, FYI you might need to setup APN settings for your new carrier, you can find how to setup APN settings by searching on Google by your carrier name, for example: "Metro PCS APN settings":

Metro PCS APN Settings:

Name: MetroPCS
APN: fast.metropcs.com
Proxy: Not Required
Port: Not Required
Username: Not Required
Password: Not Required
Server: Not Required
MMSC: http:// metropcs.mmsmvno.com/mms/wapenc
MMS proxy: leave it blank
MMS port: leave it blank
MCC: 310
MNC: 16
Authentication type: Not Required or just use the default value shown