will i be notified if my flex bucket balance is running low?

No. You can check your Flex Bucket balance anytime by...

•    Dialing *PAY from you Cricket phone or calling 1-800-CRICKET.
•    Logging into My Account on mycricket.com or via your phone's mobile web.

Please note that If you don't have enough funds to make a purchase, you will get a message during the transaction.