Use a small object to depress the tray so it pops out
Here is the way to unlock for your AT&T phone to use any SIM Card
Unlock Your Cellphone Use Any Network in The World
https://www.unlockninja.com/
SOURCE: htc 8925 error "sim card
I see this is an older post but I wanted to post the solution that helped me after a very frustrating 30 minutes. I was having the same problem. I bought a new phone (HTC 8925), and when it arrived, I plugged it into the wall charger and inserted the SIM card. I still got the "SIM card not detected" error. After removing an inserting, checking all possibilities of having done it wrong, and searching the internet only to not find the answer, I tried something that worked.
My solution: When I unplugged the charger and reinserted the SIM card, it worked immidiately. It was as if being plugged into the charger was not allowing the phone to reboot completely, even though I was powering the phone down and back up again. Since this was the solution, if you are having the problem and not connected to a charger, I would try a soft reset by pressing the stylus into the button (tiny whole) to the right of the USB port.
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