One of the members on our family plan is going to be working all summer in an area covered under "Partner Coverage". It notes that excessive use of this can result in early termination. What exactly defines "excessive use"?
Off-net Usage: If your minutes of use, data usage or messaging usage (including unlimited services) on other carrier networks ("off-net usage") during any two consecutive months exceed your off-net usage allowance, AT&T may, at its option, terminate your service, deny your continued use of other carriers' coverage, or change your plan to one imposing usage charges for off-net usage. Your off-net usage allowance is equal to the lesser of 750 minutes or 40% of the Anytime Minutes, the lesser of 6 MB or 20% of the MB included with your plan, or the lesser of 3000 messages or 50% of the messages included with your plan. AT&T will provide notice that it intends to take any of the above actions, and you may terminate the agreement.