The voter identified as Shiv Shankar, clicked a selfie inside the polling booth on Friday morning, following which a complaint was lodged by an election official and a case was registered, they said.
"Use of mobile phone within the polling station is prohibited. He took a selfie inside the polling station and has been taken into custody," Deputy Commissioner of Police (Shamshabad Zone) N Prakash Reddy told PTI.
A case under IPC section 188 (Disobedience to order duly promulgated by public servant) has been registered, the DCP said.
The Election Commission has banned use of mobile phones inside polling stations.
