Teachers, who have been assigned the duty of invigilators, will have to hand over their mobile phone 30 minutes before the start of examination to the venue-in-chage who will be a government official, Board president Kalyanmoy Ganguly told reporters Saturday.
He said the move was aimed at preventing malpractices.
Disciplinary action, including suspension, will be taken against those violating the rule, he said.
Students were barred from carrying mobiles in the earlier editions of the exams.
The Madhyamik examinations will conclude on February 22.
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