Orange Fails To Honour STOP

I've just received a Star Wars Episode 3 spam SMS message from Orange.

I've previously opted out of marketing messages, so I shouldn't be getting them. However, now all mobile operators should honour the STOP protocol, I decided to send back a STOP message to Orange.

Here's the really annoying thing...

They have sent false message headers in the SMS message so it's impossible to reply to. My Nokia 7610 complains of invalid contactdetails: from_orange.

It's behaviour like this that gives the mobile industry a bad name. It's worse that it's from a network operator!