SoftBank Group Corp. apologized Thursday for disruption of its mobile phone services, saying they were fully recovered by 6:04 p.m. the same day, the cell phone operator said Thursday in a statement.

The problem came less than two weeks before the telecommunication giant's mobile unit, SoftBank Corp. is scheduled to go public in Japan's largest ever initial public offering.

Users began experiencing problems with phone and data connections around 1:39 p.m., and the issues continued throughout the afternoon until gradually being resolved from around 6:00 p.m., according to SoftBank.