To remove the SIM card from your iPhone, you'll need to eject the SIM card tray with a special tool or paperclip.

A SIM card, or subscriber identity module card, is essential component of any phone. It connects your device to a cellular network and stores vital information, including your phone number. Many ...

So you're waiting for a phone call from an important client, but then you notice that your iPhone says "SOS" in the spot that's supposed to feature your cell signal bars. And now, your iPhone can't ...