Before beginning, please make sure that you are using the correct-sized SIM card for your iPhone or Android.
To Insert a SIM Card Into an iPhone:
Stick a pin into the slot on the side of your iPhone. This should cause the SIM card tray to pop out. Your SIM card should be placed here, and re-inserted back into the phone.
To Insert a SIM Card Into an Android:
With the large variety of Android devices, there is no one way to insert a SIM card into your phone. For specific instruction on where to insert your SIM card, please refer to your phone’s manual.