SIM Card Issues
So why does a SIM card start to have issues? There are actually several reasons why a BlackBerry may not be able to recognize a SIM card. Often, this is because the card itself isn't seated properly or perhaps the card is corrupted. Maybe it just needs to be cleaned. Here are some reasons why SIM cards may not be working and information on how you can fix the issues.
SIM Card Isn't Installed
On some cell and smartphones, there may be an icon within the notification bar that tells you when you have your SIM card installed, however, some phones may not have this. Newer BlackBerry models may not have an icon to indicate there is a SIM card installed. Instead this may be listed under an SD card or storage area, where you can learn about how much room you have on your phone.
When you receive a message that the SIM card is not installed, but yet you have a SIM card within your BlackBerry, the simplest thing is to remove your SIM card and then replace it back within its slot. Sometimes the card can become unseated, especially if you have a BlackBerry where access to the card is on the side of the phone instead of under the battery case. Make sure you are firm in pushing the card back in, but aren't forcing it into the slot.
With some phones you may be able to hear a click when the SIM card is in place, but most likely making sure that the card is secure will alert you that it is in properly.