T-Mobile is possibly pressuring its dealers not to sell services from MVNO Helio. According to a report by Hankook Daily's U.S. branch, T-Mobile has threatened to withhold its own dealer codes if these third parties sell Helio handsets. Interestingly, T-Mobile has attracted around 35 percent of Koreans living in the U.S. with its cheap pricing.

To read more about T-Mobile's dealership practices:
- check out this article from The Korea Herald