Anybody use 18185.co.uk

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Seems to be an easy to save money on phone calls.

Example a daytime call to a fixed landline is 0.0p per min and a connection fee of just 5p.so use 18185 during the week and BT at weekends.Lots of thier other rates seem cheap to. Australia for 1p per min,and uk mobiles 6p per min

Just wondered if anybodyelse has signed up,I've signed up but yet to make a call Are there any downsides as I couldn't see any

http://18185.co.uk/rates.php

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Is that a no then