I haven't setup my voicemail yet on my new Sprint HTC Hero. Here's the problem I'm having: I click on the Voicemail Icon, and there's a pop-up message that states: When I tap on this "Upgrade" button, I get the following warning: I get a warning message again when selecting to change the settings and checking the box allowing it to do so. What is going on here? I can't use, or setup, my voicemail? EDIT: I've gone ahead, changed the settings to allow the non-Android download, checked the box to change these settings (I should probably uncheck it now that the new voicemail has been downloaded), and now the voicemail is working. I assume this was okay to do because it was probably an HTC voicemail software upgrade and that's why I had to accept the warning of downloading something "non-Android" at this time. Correct? Also, should I go back into settings and change: Menu --> Settings --> Applications (Manage Applications) --> Unknown Sources Should I uncheck this box now? It was unchecked before, but I checked it to download the voicemail upgrade. I think the best thing to do is switch it back to the default so I get the warning about non-Android downloads Correct? Concur? Agree? .