What are the reasons for SIM card replacement? A SIM card replacement is done only on the following reasons; SIM Card Lost or Stolen SIM Card Damaged or worn out SIM Card Blocked (PUK or PIN Blocked) SIM Card Error (i.e. insert SIM or Invalid sim shows when inserted in the phone) Related articles What information is required when doing a SIM card replacement? Where can I do a SIM replacement? Visit our Help Centre Wowi SQ733 3G What happens after I replace my SIM card?