Sometimes, you might have trouble finding the SIM card number on your Samsung phone. This can happen for a few reasons. First, the SIM card might not be in the tray correctly. It is a good idea to turn off your phone. Then, you can take out the SIM tray and put the card back in. Make sure it fits just right. If that doesn't work, there might be a problem with the card itself. The card... b2breviews.club