(This is my first post in this forum--if this post fits better in one of the other sections, let me know) I recently got an HTC Inspire 4G from AT&T. Great phone. Then I discovered that I cannot use Skype to make voice calls unless I am on wireless. This perturbs me because another friend of mine with a Motorola Android can do so just fine on Verizon. So I discovered a version of Skype I could download that would allow me to make voice calls over 4G. Then I tried to learn how to manually install an app from an APK file. Of course, the phone doesn't allow me at first to install non-market apps. Every web page I googled shows the same screenshot: go to settings > applications and check the "unknown sources" box. But it wasn't on my phone. A quick call to HTC tech support revealed that AT&T specifically requested this to be disabled so that users CANNOT set it to allow non-market apps. For our own protection, of course... riiight. I tried using Android Injector to install the app from the desktop (after installing USB drivers and enabling USB debugging mode). It kept failing, with an error that there is insufficient disk space... which seems unlikely, since the SD card is mostly empty and I have 0.93 GB of internal storage space remaining. I tried Droid Explorer, but that failed to completely install--that's what I get for trying beta software, I guess. So is there a way around this? How can I make Skype calls over 4g? How can I make the phone allow me to install non-market apps? Is this a case where "rooting" would help?