SK Telecom plans to invest up to $270 million in Helio, the wireless voice and data services joint venture that the company shares with EarthLink. The MVNO had 130,000 subscribers in August, however it could post a loss of up to $360 million for the year. The continuous losses have been affecting EarthLink's bottom line. EarthLink's stock got a bump in the right direction upon announcing the SK Telecom cash infusion.

For more:
- read this press release
- read this article from BusinessWeek