this has been a problem tht digi has n they always blame it on app world.
i do the same thing that barretrs does, n all two times a day i get a text from digi sayin "insufficient funds for session"!!! n when i do hav credit on the phone, it takes the credit for data charges n i hav on a bb plan!! we jus hav 2 deal wit it until we actually get a proper telecommunication company.