I know some of you have found a way to use this feature without paying for it and AT&T knows about it. The article doesn't specifically say Android but if they know you're doing it on an iPhone, chances are high they know about it on Androids as well.
AT&T Warning Users Over Unofficial Tethering - Threatens To Auto-Enroll Them In DataPro Plan | DSLReports.com, ISP Information
AT&T Warning Users Over Unofficial Tethering - Threatens To Auto-Enroll Them In DataPro Plan | DSLReports.com, ISP Information