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

Unlocking instruction for Acer Iconia Talk S ?

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

Your Acer Iconia Talk S is now unlocked.