Until its takeover in 2008, Hanaro controlled nearly half of the Korean landline market, as it was the only last mile-competitive local exchange carrier (CLEC) other than the state-owned KT Corp. SK Broadband also has a division known as "Broad &" that controls a large portion of the South Korean calling card market.

In October 2014, SK Broadband unveiled the world's first 10 Gbit/s Internet service at the ITU Plenipotentiary Conference.

[7] To consolidate its position in the broadband market, Hanaro acquired its second largest rival, Korea Thrunet, in March 2005 for 471.4 billion won ($460 million); the final price was five percent less than Hanaro's original offer to outbid Dacom.

In November 2015, SK Telecom agreed to acquire a 30% stake in competitor CJ HelloVision for KRW 500 billion.

[citation needed] In September 2021, SK Broadband sued American pay television service Netflix to pay for the increased network costs and bandwidth which it blames on popular shows such as Squid Game.