In the past, due to the prevalence of fraud, esims were collected online without a phone number. Fortunately, a plan for esims collected at the airport with a number was introduced. Otherwise, it would be inconvenient to wait in many places in Korea. After entering the country, go to the SKT counter and show the kkday QR Code to the teller. , print out a piece of paper and scan the esim QR code above to activate it immediately. There are also sim cards/esims with numbers for sale on-site, but they are slightly more expensive than online. It is recommended to order on kkday and pick them up on-site (interlude: the clerk first I thought it was a physical sim card, but I reminded him that it was an esim and he helped me replace it.) Subsequent use is exactly the same as the original esim plan. I have repurchased it for the third time. The only drawback is that it is more expensive than other esims without numbers XD