KTF, South Korea's No. 2 mobile operator, reported a 37% drop in quarterly profit on Wednesday due to higher marketing costs to attract subscribers for its high-speed mobile
service.

KTF is aggressively marketing its high speed downlink packet access (HSDPA) service, launched nationwide in March, hoping video calls and other "third-generation" mobile services on the faster network will help it eventually take on leader SK Telecom.