The Delhi Prison administration seized more than 300 mobile phones from inmates on the prison premises.
The prisons department started a special drive to check mobile phones on inmates two months ago after reports of inmates smuggling phones came to the fore.
The prisons authorities recovered 348 mobile phones from different jails, including Tihar, Mandoli and Rohini prison.
A total of 18 mobile phones were recovered from jail number 3 as part of the inspection drive.
The prison authorities developed a network of surveillance and during inspection found mobile phones from the inmates.