News.com reports that in a high-tech bid to curb cheating, some Chinese universities plan to block cellphone signals in exam halls. Around 9.5 million students are scheduled to take college entrance exams next week, but there are only 2.6 million vacancies, which highlights the incredibly competitive nature of the examinations. In 2005, approximately 1,700 students across the nation were caught cheating, in some 30 cases. Students in those cases were caught using hidden telecommunications equipment to facilitate cheating…