Can I cancel my service while it's still active or extent my service period? Kimchi Mobile Team August 11, 2017 02:18 Updated Follow You can use your SIM card for 90days upon your arrival and service will not be extended. If you would like to continue using this service, please sign up for a contract plan at kimchimobile.com Related articles What is the plan of Prepaid SIM card service? How can I make an international call to my family? Can I let other people use my service? What kind of devices can I use? Comments 0 comments Please sign in to leave a comment.