It's to protect young children. They come blocked so parents don't have to go through the whole process of getting them blocked. They block them all and if people want to view this 'ahem' sites then they can get them unblocked either by calling customer services, going into store with id or on your online account.
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EE Contact Details...
150 from EE Mobile 0800 956 6000 (Option 5) from any other phone 0800 079 8586 Home Broadband & EE TV