My SIM isn't working. What shall I do? Kimchi Mobile Team August 11, 2017 03:59 Updated Follow Please try the following steps: Please Check if the Phone detects the SIM card Please Check if there is a signal with signal bars. Related articles I got my SIM card but data is not working. How can I check my monthly bills or data usage? How much is the SIM cost? What is the plan of Prepaid SIM card service? Can my family make an international call to me in South Korea? Comments 0 comments Please sign in to leave a comment.