O2 have long had filters on their WAP/GPRS/3G networks to protect the children but as more attention is being focused on Internet filters and their ineffectiveness we’ve come to realise just how bad the situation is.
As the OpenRightsGroup aptly puts it;
O2’s under-12 whitelist includes mcdonalds.com but excludes childline.org.uk - showing that their aim of promoting child safety with this product really is not delivering very well.Jim Killock
Unfortunately as more and more people complained O2 started blaming 3rd party organisations;
@pseudomonas We use BBFC who review content that’s suitable for under 12s so we can offer our parental opt-in service.
— O2 in the UK (@O2) December 23, 2013
BT likewise tried shifting some of the blame for their disgusting blocking of material about “gay and lesbian lifestyles” as just being a mistake in the wording;
There has been an accidental mis-description of the way our parental controls operate. Some parents of very young children may wish to block sex education material.
One of our optional filters does just that. It does not discriminate between heterosexual and LGBT content. We apologise for any confusion that has been caused.
We shall review the way we describe the optional sex education filters available for parents of very young children. The filters in question are not turned on by default but must be activated only if chosen by parents.
BT Spokesperson
The OpenRightsGroup and TheRegister have more detailed articles on the subject.