1. Is it necessary to return the SIM card after completing the contract cancellation? May 25, 2020 08:42 No, it is not necessary to return the SIM card. After contract termination, please dispose of it. Related articles 3. How to cancel my contract? 2. I have just received my sim package, but it doesn't work on any device after completing the necessary settings. Can I get another sim card? 1. How to contact the Customer Support Center? 4. I forgot to make payments for a few months, and my service has been terminated. Can you reactivate it after I complete all the pending payments? 3. My documents are not eligible for registration at the document screening step. Can I cancel the purchase and get a refund?