As with any phone, the battery does wear out, and iPhones are no different. Once the battery dies, the iPhone will not last more than a day. However, replacing the battery of an iPhone is more complicated than standard cell phones, as the iPhone is sealed tightly and the back does not easily slide off. You can replace the battery and any old apps without having to buy a new phone.
Instructions
Replace iPhone Battery
1. Remove the SIM tray at the top of the iPhone by hooking an unfolded paper clip through the loop and pulling out. If you still have the tools that came with the phone, then a SIM card removal tool is included, and you can use that tool instead of the paper clip.
2. Unscrew the two small screws on each side of the docking slot at the bottom of the phone by using a small Phillips-head screwdriver.
3. Insert the blade of a cutting knife in between the front glass panel and the chrome ring around the phone. Apply a little bit of pressure to separate the back panel from the display.
4. Lift up the front panel carefully. Look for two ribbons that connect the front and back panel near the SIM card end; you do not want to break these ribbons. Unplug the ribbons by lifting them carefully from the main board. Locate a third ribbon underneath one of the two visible ribbons, and unclip this third ribbon to remove the display front from the back panel.
5. Unscrew the seven small screws found along the long edges of the back of the iPhone. There are three visible screws on each side, and one more screw underneath the "Do not remove" sign. Use a small Phillips-head screwdriver to remove the screws.
6. Locate a fourth ribbon at the bottom of the back panel near where the docking port is located. With the fourth ribbon unattached, lift out the motherboard to expose the battery. Remove the old battery and replace it with a new battery.
7. Work backward from step six to step one to put the iPhone back together.
Replace iPhone Apps
8. Connect your iPhone to your computer and open iTunes. Right-click on your iPhone icon underneath the available devices found on the lefthand side of the iTunes toolbar. This will back up all of your apps, movies, music and other data found on your iPhone.
9. Connect your new iPhone to the computer and wait for the "Set Up Your iPhone" dialog box to open.
10. Select "Restore from the backup of:" in the dialog box and find your latest backup file. Click the continue button, and all of your old apps will be added to the iPhone.
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