Jails' purge on 'smart' phone use; CRIMINALS.
Traditional call signals were barred to stop such empires operating after illicit mobiles in jails hit record levels - with one in 10 lags having access to a phone.
But Skype and smart phone technology now lets them carry on business as usual.
A source said: "The problem is the criminals are always one step ahead of the law. If we come up with a barrier they find a way round it."