Approximately 30-thousand subscribers terminated their contracts with the nation’s second-largest mobile carrier, KT, in the first three days after the company began waiving its cancellation fees over a recent security breach.

According to industry sources on Saturday, 31-thousand-634 users canceled their contracts with KT between Wednesday and Friday, of whom 18-thousand-720, or 59 percent, signed new contracts with the leading carrier, SK Telecom.

Seven-thousand-272 opted to sign with the third-largest carrier, LG Uplus, and the remaining users selected service plans with mobile virtual network operators.

Industry observers say a majority of the users who signed with SKT did so because of its reinstatement policy for subscribers who left the leading carrier after its own data breach in April.

The observers also mentioned a lack of customer confidence in LG Uplus, which is at the center of a separate data breach, as well as allegations that it concealed important records.

Earlier, a joint government-civilian probe found that the mobile numbers, international mobile subscriber identity numbers and international mobile equipment identity numbers of 22-thousand-227 KT users were compromised after an illegal femtocell accessed its internal network.

The illegal access also resulted in unauthorized micropayments totaling 243 million won, or around 168-thousand U.S. dollars, affecting 368 users.

KT will continue to waive its cancellation fees until January 13.