How to Unlock Dell Phone:
Instructions for entering the Unlock Code:
Turn on your Dell phone with a sim card from a different network. The Phone will ask for you for “Sim Network Unlock Pin” or “Enter Unlock Code”
Then Enter the unlock code we provided.
Your Dell phone is now unlocked!
Make sure your Dell phone/tab asks for Unlock code. If it doesn’t ask for unlock code, it cannot be unlocked. No refund in such cases.
Unlock all Dell Devices Including:
Mini 3
Mini 5
Streak 5
Dell XCD28
XCD35
Streak 7
Venue
Venue Pro
Aero
+ all other Dell models
EN_US 
ES 
JA