If you’re the Leader of a Red+ group, you can set optional individual data limits for your Sharers. So when they reach their personal limit they’ll be unable to use the group’s data allowance until the following month.
It's easy to change an individual Sharer’s limit online using either of the following options:
Alternatively, you can text CHANGE DATA LIMIT followed by their mobile number and their chosen individual limit (500MB, 1GB, 2GB, 4GB, 8GB, 12GB or UNRESTRICTED) to 40506
If you’ve already set a limit on a Sharer’s account and want them to be able to use as much data as they like from the remaining allowance, you can update their limit to UNRESTRICTED.