Mobile phones are banned from prison as they could be used for criminal activity and to plan escapes.

Source: https://www.dailymail.co.uk/news/article-11980865/Prison-inmate-influencers-rack-millions-views-showing-cushy-lives-TikTok-videos.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Mobile phones are restricted to certain areas of the estate while smoking and vaping are completely banned.

Source: https://metro.co.uk/2023/05/05/coronation-lamb-and-a-toast-to-the-king-at-charless-highgrove-retreat-18690831/

“Troops also recovered 4 Mobile phones, 3 bicycles, Airtel Recharge card worth N8,000.00, 32 AK 47 rifles, 22 AK 47 rifle magazines, 303 rounds of 7.62 mm Special ammunition and one vehicle.

Source: https://www.vanguardngr.com/2023/09/military-neutralises-52-terrorists-apprehends-60-dhq-2/