Northern Ireland businesses warned about phone hacking 4 April 2013 Last updated at 06:19 Businesses in Northern Ireland have been warned about phone hacking after a number of companies reportedly lost thousands of pounds. The warning has come from independent business telecoms company, Rainbow Communications. It said criminals have been breaking into phone lines remotely and racking up large bills. One Belfast firm lost £10,000 in just one weekend while another in north Down lost £3,000, the company said. "It is the business that is solely responsible for the fraudulent call charges so it really can have a detrimental effect on any firm in Northern Ireland," Rainbow Communications said. This type of activity is linked to organised crime and the international criminals are increasingly targeting UK companies. There have been cases of businesses losing tens of thousands of pounds.