▁When ▁users ▁try ▁to ▁access ▁blocked ▁content ▁they ▁are ▁redirect ed ▁to ▁a ▁warning ▁page . ▁This ▁tells ▁them ▁that ▁they ▁are ▁not ▁able ▁to ▁access ▁an ▁' over ▁ 1 8 ▁status ' ▁Internet ▁site ▁and ▁a ▁filtering ▁mechanism ▁has ▁restricted ▁their ▁access . ▁C ategories ▁that ▁are ▁listed ▁as ▁blocked ▁include : ▁adult ▁/ ▁sex ually ▁explicit , ▁chat , ▁criminal ▁skills , ▁dru gs , ▁alco hol ▁and ▁to b acco , ▁g amb ling , ▁hack ing , ▁hate , ▁personal ▁and ▁d ating , ▁violence , ▁and ▁weapons . ▁Users ▁who ▁are ▁adult s ▁may ▁have ▁the ▁block ▁lifted ▁on ▁request . ▁ ▁Gu idel ines ▁published ▁by ▁the ▁Independent ▁Mobile ▁Classification ▁Body ▁were ▁used ▁by ▁mobile ▁operators ▁to ▁class ify ▁sites ▁until ▁the ▁British ▁Board ▁of ▁Film ▁Classification ▁took ▁over ▁responsibility ▁in ▁ 2 0 1 3 . ▁Classification ▁determ ines ▁whether ▁content ▁is ▁suitable ▁for ▁customers ▁under ▁ 1 8 ▁years ▁old . ▁The ▁default ▁assumption ▁is ▁that ▁a ▁user ▁is ▁under ▁ 1 8 . ▁ ▁The ▁following ▁content ▁types ▁must ▁be ▁blocked ▁from ▁under ▁ 1 8 ' s : ▁ ▁Su ic ide , ▁Self - harm , ▁Pro - An ore x ia ▁and ▁e ating ▁dis orders ▁ ▁Disc rimin atory ▁language ▁ ▁Enc ou rag ement ▁of ▁D rug ▁Use ▁ ▁Re pe ated ▁/ ▁ag gress ive ▁use ▁of ▁' c unt ' ▁ ▁P orn ography ▁Rest rict ions ▁ ▁Vi ol ence ▁and ▁G ore ▁restrictions ▁