The waiting time for receiving an unlock code for Acer phones starts from 24 minutes to 48 hours.

Unlocking instruction for Acer Liquid Z6 Plus ?

How to enter an unlock code in an Acer Liquid Z6 Plus:
1. Turn on Acer Liquid Z6 Plus with an unaccepted sim card inserted (from a different network)
2. enter the unlock code provided by sim-unlock.net

Your Acer Liquid Z6 Plus is now unlocked.