I've tried several apk files on the sd card, but NONE of them will install. I tap the file. It says installing... then pops up with "Application not installed ApplicationName could not be installed on this phone." ...uh, phone? ApplicationName, is, of course, whatever I've tried to install. Really, if I could just get the Kindle reader on this thing, it would serve its purpose. I even tried older versions of Kindle from freewarelovers.com. Not even the oldest of the apk files will install Kindle. Is there something I need to unlock on this thing? I've already gone to Settings>Applications and allowed Unknown sources. I think it's running Android 2.2? Help?