I'm not sure if this method has been shown before or not. I only thought about posting this because I know people ask about how to do this and alternate methods. Like this method that was posted the other day.
This method Involves using Gmail and emailing the .apk to your gmail account that is synced with your phone.
Open Email that contains the .apk attachment
Click on the Button next to the attachment that Says "Preview" It will open the following Pop-up.
You may get this pop-up. If so click settings then click Unknown Sources. (make sure it has a Green check Mark next to it. AFter you've done this, Return to the Email. and start again.
AFter it Fetches the Attachment. It will ask you to install. Click Install!
And then there you go! you have it installed!
Hope I haven't repeated a commonly known method.
Enjoy!
This method Involves using Gmail and emailing the .apk to your gmail account that is synced with your phone.
Open Email that contains the .apk attachment

Click on the Button next to the attachment that Says "Preview" It will open the following Pop-up.

You may get this pop-up. If so click settings then click Unknown Sources. (make sure it has a Green check Mark next to it. AFter you've done this, Return to the Email. and start again.

AFter it Fetches the Attachment. It will ask you to install. Click Install!

And then there you go! you have it installed!

Hope I haven't repeated a commonly known method.
Enjoy!