Seems like "Virgin Mobile Minute Checker" author has not updated the app for a while. I contacted him with no success. Surprisingly, Virgin Mobile also does not offer any app to manage your account.
Ultimately, I have started working on my own version. It is in google's play store under name "Virgin Mobile Minutes" (it has "V" and "m" letters in logo). It is free for everyone to enjoy. It is missing a widget for now - I will add it soon.