Glad this is being brought to attention finally (as it seems it's been discovered before), but this is just yet another case of a UK mobile operator losing my trust.

O2: Send number in plain-text to every website visited. [1]

Orange: Increase fixed contract price by RPI through use of dodgy contract clause. [2]

Three: Place a non-payment flag on my credit report for no apparent reason. When I realise years later, they remove it and don't even apologise.

I'm running out of operators which haven't negatively impacted me, and to be honest, I think some of the blame must land with OFCOM.

[1] - http://news.sky.com/home/technology/article/16156276

[2] - http://en.wikipedia.org/wiki/Orange_%28UK%29#Controversy