hey guys , im having problem with buying mobile booster , coz when i waant transfer money from my phone to acc it says i dont have enough , and i do have enough , so why is it happening?

You may have enough on your phone, but it may not be the right type of credit. I had this problem once before.
Say with Optus, you have all these different things like "my credit", "my time money" and "power up money". Out of these only "my credit" will work.

how does my credit work ?