How to Unlock the Phone for an HTC Aria

1. Contact AT&T at 800-331-0500 or dial 611 from your mobile phone and ask the customer service representative to provide the unlock code for your HTC Aria smartphone.

2. Pull the Aria's front panel away from the back cover to reveal the battery and the SIM card slot. Place your finger in the notch above the battery and remove the battery. Set the battery and the cover aside.

3. Slide the AT&T SIM card out of the SIM card slot. Insert a SIM card from a different wireless carrier. The gold contacts on the new SIM card should face into the phone as you insert the card.

4. Re-install the battery. Slide the bottom of the Aria into the bottom of the back cover and snap the cover in place.

5. Hold down the 'Power' button on top of the Aria to turn it on. The phone will prompt you for your unlock code.

6. Enter your unlock code using the keypad on the Aria's touch-screen. Once you have entered the code, your Aria will accept SIM cards from any wireless provider.