It is often inconvenient when trying to order delivery service, call, or text if you only use DATA. This is the perfect SIM card for those who want to use internet data, voice calls, and text messages! This is an Unlimited / Rechargeable prepaid SIM for foreign tourists who want to use DATA without restriction and get local calls/messages.• You can freely use it for 30 days with LTE speed! • Highly recommended to foreign students, travelers, or long-term backpackers.• You can use all of the functions from Text message/Call/International Call/International Message within 11,000 won(KRW). USIM Information 1. Data : Unlimited 4G/LTE (5mbps) 2. Cost of voice charge : 11,000 won(KRW) The cost will be deducted from 11,000 won. • International Call : 4.4 won(KRW)/Sec ※ Receiving is free • Domestic Message : 110won(KRW)/ 1 Txt msg • International Calling : 24.31won(KRW)/Sec For the country of USA/Japan/Taiwan/Hongkong/Singapore won(KRW)/Sec)※ Reception is free • International Message : 330won(KRW)/Per 1 message • Validity Period : 30days  ※ Available to extend(Extendable fee 36,300 won(KRW)-Unlimited Data +30 Days / 11,000won(KRW) Voice charge**Availalble to charge the calls only)