"Electronic gadgets like cellular/mobile phones, any other devices for communication, laptop, bluetooth device, and calculator are banned inside the examination hall.
"Any infringement of these instructions shall entail disciplinary action against the candidates concerned including debarment from future examinations/selection," the UPSC said.
The civil services examination is conducted annually by the Commission in three stages -- preliminary, main and interview -- to select officers for Indian Administrative Service (IAS), Indian Foreign Service (IFS) and Indian Police Service (IPS) among others.
The civil services preliminary examination 2017 is scheduled to be held on June 18.
UPSC To Conduct Civil Services Exam Early Next Year, Annual Exam Calendar 2018 Released
About 4.59 lakh had taken the last year's civil services prelims.
Of these, 1,099 have been declared successful, the result of which was declared on May 31.
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