I've just tried that number you quoted in the article (09062121111) on their online checker at http://www.phonepayplus.org.uk/numberchecker/ and got the following response:

PhonepayPlus has the following information about the number 09062121111.

* The number offers a technical support line for broadband internet. This is promotod through various sources, including magazines, the internet and television, and you use it with you telephone or mobile phone.

* This service costs 25p per minute (plus any phone network surcharges - check with your phone company for full details).

If you would like to find out more about this service or have a question about it you should contact the company that provides this service which is listed below.

NTL Group Ltd

ntl House

Bartley Wood Business Park

Hook

Hampshire

RG27 9UP

Tel: 01256 753940

So either there is a discrepancy between their online database and their text service database or else they read El Reg and rushed to update it!