You can check your Mandiri balance periodically to find out the in and out of money in your Mandiri account.
You can control it well through the available standalone mobile banking. besides that you can check your Mandiri balance at an ATM or at a bank / teller to find out the rest of your Mandiri balance. You can get other optional instructions by downloading the How to Check Mandiri ATM Balance application on your cellphone for more details.