How do you change SIM cards?

Usually you open up the back of your phone and your sim card is being held in a holder, sometimes you may have to remove the battery if it's in the way. You take that sim card out and put in your new one. Sometimes phones take a minute or two to load with the new sim card. If you do that, it should load the sim cards information and regular phone number, unless it is a sim card from a different service provider, which in that case it may not work and show errors.

If your phone has one, turn off the power, remove the battery and typically the sim card is behind the battery. Often a clip or slide holds the sim card in place so you may need to examine it to figure out how to remove the sim card. YOU TAKE IT OUT AND PUT A DIFFERENT ONE IN!