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| August | 1993 | Global TaNK Co., Ltd. was founded as a sole agent of marketing U.S. Telegroup, Inc. |
| December | 1995 | Global Access Direct (Type-2 International Telecommunications) service launched |
| June | 1996 | Developed Intelligent billing system jointly with Lucent Technologies |
| December | 1996 | Traveling Card (Accessible from 54 countries) service launched |
| March | 1997 | Primary agency agreement of domestic Long-Distance services with the 4 major domestic telecommunication companies concluded |
| July | 1999 | UltraCall international telecommunication service launched as the first resale of Type-1 service in Japan |
| March | 2000 | Intelligent Invoice (customized invoice per extension) service launched |
| September | 2000 | International call service for Cellular and PHS phone launched |
| December | 2000 | In-house transmission speed detection method developed |
| May | 2001 | Conference Call service (connecting up to 90 parties) launched |
| November | 2001 | Worldwide Mobile Phone rental service launched |
| February | 2002 | International Toll-Free Collect Call service launched |
| August | 2002 | Call Forwarding (call forwarding service to overseas) launched |
| December | 2002 | International ISDN service launched as the first resale in Japan |
| May | 2003 | Videoconferenceing system service launched in partnership with major VC manufacturers |
| July | 2003 | Distribution of Inmarsat/Iridium satellite services launched |
| August | 2003 | Fixed phones to Mobile phones discount service launched |
| September | 2003 | Local-call service launched (The lowest rate in Japan) |
| September | 2003 | Data Communication service launched |
| October | 2003 | Domestic Toll-Free Call service launched |
| April | 2004 | Ultra ISDN1500 service launched |
| July | 2005 | UltraCloud service launched |
| March | 2006 | Osaka Access Point for Conference Call service launched |
| May | 2006 | Domestic call new savings plan - Diamond Plan launched |
| April | 2007 | Nagoya Access Point for Conference Call service launched |
| June | 2007 | Tokyo Data Centre located |
| March | 2008 | Direct line service (ISDN1500, ISDN64, Analog) launched |
| November | 2008 | Mobile call distinction service launched |
| June | 2009 | Large-scale conference call service launched |
| November | 2009 | Direct and dedicated lines service launched |
| March | 2010 | Call centre consulting service launched |
| August | 2010 | UltraNetCom service launched |
| April | 2011 | Kobe Data Centre located |
| November | 2011 | Tokyo Data Centre relocated |
| December | 2011 | Multi Carrier Centrex service launched |