When an iPhone freezes, it becomes difficult to place calls, read emails or complete other business-related tasks. There are several steps you can take to resolve these issues, from restarting your device to restoring it. Begin with the most basic steps to troubleshoot the issue and progress to more involved steps, if the issue isn't resolved.
Restart or Reset Your iPhone
If your iPhone suddenly freezes or refuses to wake from sleep, you can sometimes resolve the issue by restarting it. Press and hold the “Sleep/Wake” button until the “slide to power off” message appears. Slide the arrow to power off your phone. Turn your device back on by holding the “Sleep/Wake” button until the Apple icon appears. If this doesn’t resolve the issue, or you cannot power on your fully charged iPhone, try resetting the device. Simultaneously press and hold the “Sleep/Wake” and “Home” buttons for at least 10 seconds. Depending on the original issue, the device should power on or take you to the “slide to power off” screen.
Sometimes a particular application becomes unresponsive and causes your device to freeze. You can close the application by holding down the “Sleep/Wake” button until the “slide to power off” message appears and then holding the “Home” button for about six seconds until the app shuts down and the home screen reappears. If you notice that your device freezes when running multiple apps, you can shut down the ones you aren’t using. Quickly press the “home” button twice in a row. Your open apps appear at the bottom of the screen. Tap and hold an open app, until a red circle with a minus sign appears on each app. Tap the minus sign to close the application, and then press the “Home” button twice to close the row.
Update the iOS
Sometimes running previous iOS software versions can hinder your iPhone’s performance or cause it to freeze, especially when using applications designed for use with the latest operating system. Additionally, Apple sometimes releases software updates designed to resolve freezing problems. You can update your device by plugging it into your computer, opening iTunes and clicking “Update” in the device summary menu. Before updating, transfer your purchases and backup your data. Alternatively, if you’re running iOS 5 or later, you can update your device by pressing “Settings,” followed by “General,” “Software Update” and “Install Now.” However, this method takes much longer than updating your device through iTunes.
Restore Your iPhone
Restoring your iPhone is a time consuming process that you should only undertake if your iPhone is still freezing after you’ve tried the previous steps. To restore your iPhone, connect it to your computer with the USB-iPhone connector, select your iPhone in the “Devices” menu and navigate to the “Summary” tab. Choose “Restore," and create a backup, if you haven’t recently made one. After restoring your phone, you can restore the iOS from a previous backup. If you still experience device problems after restoring from backup, restore your device and set it up as new. This prevents software bugs from transferring from the backup and returning to your device. You can still preserve the majority of your data through the syncing process.
Download a System Monitor
Applications are available through the iTunes store that provide information on your iPhone’s performance, such as memory usage, system logs and cache information. By monitoring this information, you can spot problematic applications or determine that a particular setting is causing your device to slow down or freeze. Additionally, some of these applications allow you to release your phone’s system memory, which can improve your iPhone's performance and resolve certain freezing issues.