Berkley School District issued the following announcement on Aug 30.
Quick Steps to Receive Text Alerts from Berkley Schools
In order to receive text messages from the District or your school, you must opt in. Text messages will be sent out when the District closes or there is an emergency situation. Texts may also be sent from the District and schools for reminder messages during the day that are not urgent.
In order to receive text messages, every parent/guardian must opt-in each cell phone listed in MISTAR.
Steps to Opt-In
Text the word YES (in the message field) to the phone number 67587 (in the To field). Then you are all set!
Original source can be found here.
Source: Berkley School District
Alerts Sign-up