LANKA BUSINESS ONLINE – LBO Sri Lanka’s biggest mobile-phone operator Dialog Telekom Thursday slashed outgoing call charges by as much as 50 percent as the firm stepped up its expansion drive in the country. Call charges within the network from 11.00 pm to 6.00 am will go down by 50 percent to 2.00 rupees, while rates for outgoing peak calls have been cut by an average 30 percent, officials said.