CallNet 0800 has closed a loophole that allowed its users to access the 24/7 toll-free service using ISDN. Until recently, some Net users were able to take advantage of ISDN connections with no dial-up costs. When this facility was pulled, ISDN users accused the ISP of foul play. But a spokesman for CallNet 0800 said: "It is clearly stated in the terms and conditions that the service is not available for people using ISDN." CallNet 0800 is a domestic ISP, and its ISDN freephone ban is to designed to deter business use. "Only a handful" of customers are affected by the ban, the company claims. ®