Nokia Lumia 925 - How do I delete messages from the SIM card to make room for new messages on my Lumia phone?

If you are getting a SIM card full error message, you will need to delete one or more SIM messages:

  1. Open the Messaging hub on the start screen, and look for the threads where a text message has SIM message tag next to the date and time.
  2. Tap and hold on the thread (or message) to delete (confirm option warns about data loss).