There are two ways to check your balance in SmartBro prepaid plug-it.
First: Check your balance online
- Go to http://smart.com.ph/connect/ and register an account.
- Go to the dashboard by entering your SmartBro number without the zero prefix. Ex. 9201234567
- Enter the password you used when you created your account.
- Select Balance Inquiry from the menu options available. A detailed balance of your account will be shown, including expiration of promos you're enrolled in.
Second: Check your balance via SMS or text message
- On Create Message type BRO BAL
- Send it to 2200. You will then receive a text message of your remaining balance.
I personally find the SMS way easier. But you should try both and see what works for you.