I stumbled upon a blog post that show on first page of google for this query and I discovered that the blogger said the glo code for account balance was *124# and I even tried testing it but it said sorry, you are not eligible to use this USSD code.

That wan shock me!

And then, I decided to do a little research with my line with different code and I discovered the real Glo Code to check account balance that works in any glo line.

To Check Your Glo Account Balance or Credit Balance, just dial #124# and Send.

Follow the instructions and reply with 1 and you would see your current account balance.