Telecom & Vodafone mobile customers can send a text to the number 300, that contains a mobile number they wish to check. They will recieve a reply back stating whether or not the number is on the same network or not.
This is a free service.
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Comment by rscole86, on 31-Aug-2007 12:25
This also works from a Vodafone mobile, though I am unsure if it is free or not. I would say it is.
Comment by johnr, on 31-Aug-2007 12:28
Yes it is free on Vodafone
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