How is it that Unicom card can't receive short messages but can make phone calls in Korea?

If you can call to show that you have enabled international roaming rights, it is recommended to put the card in other terminal phones for testing to check whether the terminal has SMS shielding function. If the terminal equipment is normal, it is recommended to call the customer service of China Unicom to refresh the international roaming function, and then turn it off and try again.

If you need to consult or complain about using international roaming service abroad, you can call Unicom's international roaming customer service telephone number186186100/kloc-0 (the dialing method for mobile phone is "+"or (international access code) 86186/kloc-0. The hotline provides roaming users with 7×24 hours free service (free only when users dial with China Unicom's mobile phone number). Users can also call their hometown customer service telephone number 100 10 to get the 7×24-hour service of China Unicom, but calling their hometown customer service hotline 100 10 will charge users according to international roaming calls;

China Unicom international roaming unified customer service telephone number 8618618610010. Only the mobile users of China Unicom can use it in the international roaming state, and the dialing method is the same as that of ordinary domestic mobile phone numbers. It is free for users to dial this number through Unicom's mobile phone outside China, and it is not free to dial18618610010 through contact methods other than Unicom.

Before roaming abroad, it is recommended to confirm whether the number you use has enabled the international roaming function, and whether the roaming place supports international calls and data internet services. You can know the specific charges of the roaming place through China Unicom APP.