Where does the SIM card go in my phone?
In most Android phones you can find the SIM card slot next to the battery in the back of your phone.
For iPhones and some androids, the SIM card is placed on a tray that slides out of the phone when you push a pin into the hole located on the side of the phone.
When replacing SIM cards for these phones make sure that the tray is fully out of the phone before you switch the SIM cards.
Never force the tray in or out of your phone as it is delicate equipment, and could break if treated roughly.