Your iPhone needs a nano-SIM card to connect to a cellular provider. Without it, you won't be able to access call networks or cellular Internet, only Wi-Fi. If you sign up for a contract when you purchase your device, this SIM card comes preinstalled. You can see Apple's full list of supported spectrum bands on Apple's iPhone webpage under "Cellular and Wireless."
If you have a contract-free phone and need to install a nano-SIM--or you need to access your current nano-SIM card--you can remove it by sticking one end of a paper clip into the hole next to the SIM card slot.
Your device comes equipped with a set of earbuds with a microphone and remote built onto the right-side cable that can control volume, change tracks, and answer and end calls. You can use these controls to perform a variety of actions with the right combination of taps.
Single-Click: Clicking the center button of the remote once while listening to music or watching a video pauses playback; if you're receiving a call, a single-click answers it, and another single-click hangs up when you're finished.
Single-Click and Hold: When you're receiving an incoming call, a single-click and hold declines the call and sends it directly to voicemail; while you're on a call, you can do this to switch to a secondary call. Otherwise, holding down on the remote activates Siri.
Double-Click: Squeeze twice, and your song skips to the next track.
Triple-Click: Squeeze three times to skip back to the previous track.
Transfer your data
You've moved to the latest and greatest in the iOS world, and to do so, you're leaving your old device behind. But before you send it off on its last voyage, you have to decide whether you want to transfer its data to your iPhone 5. Here are the various ways to do so, depending on whether you're moving from an old iPhone, a different smartphone, or a feature phone.
Upgrade from an older iPhone