ENKR

Turn on the carrier's USIM protection service

Ties your USIM to your current phone, so even a copied or stolen SIM cannot be used in another device. SK Telecom, KT and LG U+ each offer it for free.

Run by
SK텔레콤 / KT / LG유플러스
Cost
free
Time
about 3 min
Where
Korea
SK Telecom's page (opens in a new tab)KT's page (opens in a new tab)LG U+'s page (opens in a new tab)Mark it done in my breach check

How to do it

  1. SK Telecom: apply in T world under 부가서비스 › 안심/보험 › 유심보호서비스, by calling 114 (02-1599-0011), or at a store.
  2. KT: sign up from the 유심보호서비스 page on KT's website.
  3. LG U+: apply in the U+one app or through the customer centre (114); business lines can apply through 114 only. Turn the phone off before signing up and back on afterwards. If you use a budget carrier on the LG U+ network, apply through that carrier.
  4. Before you move the SIM to another phone, cancel the service through the same channels after identity verification.

What it does

Carrier billing (micropayments) charged to your number
makes it harder
Moving your phone number to another SIM
makes it harder

SourceSK텔레콤 T world (opens in a new tab)checked October 16, 2026