It was as early as the year 1875 that Graham Bell's path breaking invention entered Denmark and very soon Denmark Telephone Operating Companies also came up and focused on customer service and the growth of infrastructure. The two main Denmark Telephone Operating Companies are:
TDC
3 (telecommunications)
TDC : TDC or the Tele-Denmark Communications had started off primarily as a landline and mobile service provider to Denmark but the the present scenario is completely different and TDC, a Denmark Telephone Operating Company serves over 15 million customers around Europe. The main services the Denmark Telephone Operating Company, TDC provides include:
Data communications and Internet services
Leased lines