This dialer code ##443336772# will flash a toast notification on the bottom of the screen with your SPC/MSL code. I found the dialer code in the Sprint Optimus G General XDA thread and I tried it on my Sprint LG G2. I had already chatted with Sprint and obtained my MSL so I can confirm it works with the Sprint LG G2. I do not know if it will work with any other phones. I tried it on my Sprint Motorola Admiral and it did nothing.
http://forum.xda-developers.com/showpost.php?p=46006443&postcount=11
