I asked Orange about this as I'd been getting a few calls/texts and they told me that a lot of the companies who call do random dialling and target specific networks by the fact that each network has a set of dialling codes it uses.
This seemed like a resonable explanation to me, so you may find it doesn't help although I guess it can't hurt
What annoys me the most is when they claim to have been endorsed by my network. The last time that happened I asked them to tell me my name or any other personal information and the guy didn't know what to say.
EDIT:
The TPS website has this to say:
Quote:
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The Telephone Preference Service can accept the registration of mobile telephone numbers, however it is important to note that this will prevent the receipt of live marketing voice calls but not SMS (text) messages. This is because under the Privacy and Electronic Communications (EC Directive) Regulations 2004 it is unlawful to send an unsolicited sales and marketing text message. Telemarketing companies who send SMS messages need your prior permission. There is no obligation therefore for companies sending SMS messages to people who have agreed to receive them, to screen against the TPS file. If you wish to stop receiving SMS marketing messages, please send an 'opt-out' request to the company involved. The Information Commissioners Office (ICO) is responsible for the enforcement of these regulations.
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http://www.tpsonline.org.uk/tps/