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I was looking for a doorbell and came across this site in London www.smartbel-revolution.com.

They claim to sell doorbells that you can answer via your mobile phone from any where in the world...

Can anyone tell me if this is true? ...Has anyone bought from Smartbel Revolution? I'm really interested in buying one as Christmas is coming and thought this would be

a great idea for my Mum and Dad for Christmas as you can vet their door caller's and speak to parents on the same call to say its safe to open the door!