Phone hacking
A few months ago, I got a new Motorola V195 cellphone from T-Mobile, only to find out that T-Mobile had locked it so that Java applications couldn't access the internet. Which pretty much kills the utility of being able to run Java on the phone... all you can do is play single-user games.
I'm off to San Diego for a conference tomorrow, so I figured I should look into fixing the phone so I can use it to do Internet stuff while I'm away. MotoModders has plenty of info on Motorola cellphones, and I found a post on their forum with instructions on how to re-enable Java network access. All you have to do is download a utility that lets you access the internal files on the phone (I used P2KTools) and delete the /a/mobile/certs/root/x509/kjava/j2me_domain_registry.sm file. I've heard that removing that file may cause some Java apps that come with the phone to stop working, but the phone didn't come with anything worthwhile (some games and a help file), and in any case, they still seem to work fine. I saved a backup in case I need it for some reason...
I also edited a "SEEM" file to un-hide the Web Session configuration menu, so I could switch the proxy server from WAP-only to HTTP. Now I can run Google Maps and Opera Mini on my phone :). However, for some reason, MGTalk with HTTP Binding won't even install.