Greater New Orleans. Layoffs hit Michoud Assembly Facility amid management changes. Nearly 200 workers at NASA's Michoud Assembly Facility in eastern New Orleans will lose their jobs in January after the maintenance contract for the facility changes hands. It is not yet clear how many jobs the new contractor will keep.
The SIM card is in a cradle. You can pop the card out of the cradle. To replace the SIM card, put the card back in the cradle. The cradle and card are notched in a way that forces you to replace the card on the proper side. Then just slide the card back into the iPhone. The SIM tray is located on the right side of the iPhone 4. Like the rest of the iPhones, there is a small hole used to release the SIM tray. A paper clip is the tool of choice. Place the paper clip in the hole a press in firmly.
The short answer is, it's a Subscriber Identity Module, and it is a small circuit board which is placed in your iPhone (or any GSM phone) in order to identify it to your carrier. It's why you can swap SIMs in GSM phones and your phone number, voice, and data plans are swapped right along with it.On older devices, especially feature phones, it also stored things like text messages and contacts). The SIM card allows you to change cellular phones and keep the same user data. The SIM card is what lets your carrier know that you're the account holder of the iPhone using it.