Received a reply from HTC UK today, Not good news, Looks like I will be getting rid of the Titan2, Damn shame as I preferred it to the Titan
Dear Andy,
Thank you for your email regarding your HTC Titan II.
My name is David and I am a Technical Support Agent for the HTC Written Team.
I'm sorry to hear that you are experiencing some difficulties setting up your MMS settings for the O2 network on your phone.
I understand that this phone was originally branded to the been branded to the At&T network. I believe the reason you are unable to change the MMS settings on your phone is because your phone was originally branded to the At&T network. Phones that are branded (locked) to specific networks usually have their operating system (Windows) slightly customised to that particular network. This would include the MMS settings as well. Because the phone is unlocked, you will be able to use any other other SIM card to make calls and send SMS messages. However, unlocking the phone does not neccessarily override the pre-installed MMS settings.
In that case Andy, it may not be possible to change the MMS settings on this phone.
Please contact HTC US for further support on this issue as HTC UK does not support this phone.
I do apologise for the inconvenience this may be causing you.
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Sincerely,
David
HTC