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

Unlocking instruction for Acer neoTouch P300 ?

How to enter an unlock code in an Acer neoTouch P300:
1. Turn on Acer neoTouch P300 with an unaccepted sim card inserted (from a different network)
2. enter the unlock code provided by sim-unlock.net

Your Acer neoTouch P300 is now unlocked.