To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.
You can activate a new or used iPhone for use with a cellular service provider in a few steps. Here's how to activate any iPhone, or troubleshoot it.
Changing physical SIM cards on your phone is always a fiddly business. First, you have to root for the little SIM tray tool ...