The difference is that the Htc Hd2 is for T mobile and it has a snapdragon processor, and the t9193 is unlocked even when you bought it new and it does not have a fast processor like the T mobile one
No
There are a number of websites that provide informations on how to get an HTC unlocked. Locally one may be able to find a technician through classified adds who will do this for a fee.
No
The majority of people that bought it were very impressed with it and called it "amazing" and said it was great for playing games on. You can find other reviews on it here: http://reviews.cnet.com/smartphones/htc-trophy-unlocked/4864-6452_7-34476537.html
Yup
The HTC Desire 300 can be locked to a specific carrier, such as Telstra, if it was purchased through them with a contract. If it was bought outright or from another source, it may be unlocked. To determine the locking status, you can check the phone's settings or contact Telstra directly for assistance.
If it's unlocked - it will work on whatever network the SIM card is designed for.
No, o2 doesn't sell the HTC Wildfire on either contract or pay as you go. You could always buy an unlocked version.
no
Yes you can. If the handset s unlocked, it will accept any carrier's SIM card.
Yes, the HTC Dream does have a touch screen, like many other HTC products.