The two regional units of Nippon Telegraph and Telephone Corp. on Tuesday experienced malfunctions with Myline, an automatic connection service that debuted the same day.
The service is supposed to make calling easier by automatically connecting subscribers to their preferred carriers and bypassing the need to dial the companies' prefix codes.
Instead, hundreds of Myline subscribers trying to use NTT were unable to connect for periods of up to a minute, according to NTT East Corp. and NTT West Corp.