Problems (and fixes):
- Shortened Battery Life
- Mail Stalls on “Checking for Mail”; Cannot Receive or Send Mail
- iPhone 3G Slowness
- Error 29 When Updating
- No 3G, EDGE or MMS Service
- iPod App on iPhone Crashes
- iPhone Reboots/Resets During Phone Calls
- No Wi-Fi
- Update Stuck on Backup or Extremely Slow
- Sync Errors
Although many iPhone users experience better battery life after the iOS 4.0 update, a number of users have reported decreased battery life after updating. A sampling of reports from Apple’s Discussion boards:
- shafeen: “Losing about 1% battery life every few minutes.”
- Graham Powell1: “Upgraded 3G last night and bettery useage is through the roof. Getting less than an hour from full charge, phone very very hot.”
- vatkins1906: “[…] Horrible Battery Life after iOS 4. Before going to bed my 3GS had 100% battery power. With no applications running in the background, I awoke with the phone completely dead! Before installing iOS 4 it would be at around 95%.”
Fixes
Check Internet tethering. Some reports indicate that the iPhone may be persistently attempting to establish a tethering connection, thereby draining the battery. Navigate to Settings > General > Network and tap Internet Tethering, then tap “cancel” if you it is trying to connect, or turn off tethering altogether. You may need to turn Wi-Fi off then back on to stop the tethering connection attempts.
Bad apps to blame? Anecdotal evidence suggests that apps incompatible with iOS 4.0 or otherwise problematic under the new release can cause battery drain issues. Backup your iPhone in iTunes, then delete apps from the device in groups (you can always sync them back from iTunes later). After each group, restart your iPhone and check for the battery drain problem. Via this method, you can isolate the problematic app and remove it permanently.
Also, make sure all apps are up to date; developers have released a flurry of iOS 4.0-compatible app editions in the past few days.
Turn off Push. Navigate to Settings > Mail, Contacts, Calendars and tap “Fetch New Data.” Turn off Push.
Calibrate the battery. Fully charge your iPhone, then allow it to drain until completely empty (device powers off on its own and displays a spinning progress indicator). Then recharge your phone and check for excessive battery drain.
Close open Safari windows. One iOS application that consumes memory and processor time (and therefore battery life) in the background is Safari. Close all unused windows in the application by pressing the page switch button in the lower right portion of the screen then clicking the X at the top left of each page.
Restore, but not from a backup (use as a last resort). As is the case with some other iOS 4.0 problems, one less-than-ideal fix for the battery drain issue involves restoring the iPhone as a new device rather than from a backup. It appears that bad holdover data from iPhone backups can cause excessive battery use. Restoring as a new phone will delete contacts and other data, but may resolve this problem.
To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”
Check Location Services It appears that overactive location services usage can result in poor battery life. Specifically, apps that use location services in the background can quickly drain the battery.
To check location services usage on an app-by-app basis, navigate to Settings > General > Location Services. Turn location services off for all applications, then turn them back on for desired apps one by one or in groups. Via this procedure, you can identify which app’s use of location services is draining battery. Alternatively, you can temporarily turn off location services altogether and check for increased battery life.
Mail Stalls on “Checking for Mail”; Cannot Receive or Send Mail
A number of users have reported an issue in which the Mail app hangs indefinitely when checking for new messages after the update to iOS 4.0. In these cases, the “checking for mail” and the spinning progress indicator display persistently, never advancing to actually receiving mail, or the check for mail button produces no action.
This issue occurs with MobileMe, IMAP, POP and Exchange accounts.
Fixes
Restart mail. If you are using a device that allows multitasking, double-tap the home button to bring up the list of currently running applications. Hold the Mail icon until it begins to wiggle, then tap the small red circle to close it. Relaunch Mail and check your mail.
Download configuration file. If you are having this problem with an Exchange account, you may need to install a configuration profile from Apple that increases the amount of time the iOS 4 device will wait for the Exchange Server to respond to its sync requests. See this knowledge base document for more information.
Turn airplane mode on then back off. Go to Settings and turn Airplane Mode on then back off.
Reboot. Simply rebooting your iPhone, iPad or iPod touch by holding down the sleep/wake button (on top of the device) for several seconds, until power off slider appears, then powering the unit back on can temporarily resolve this issue.
A number of iPhone 3G users have experienced a significant degradation in performance after the iOS 4.0 update. iPhone 3GS users generally report across-the-board performance improvements with the new update, but original iPhone 3G users have reported slow app launching, delayed reactions to taps, and generally poor interface responsiveness.
Fixes
Perform a “hard reset.” Hold down the sleep/wake and home buttons simultaneously for roughly 15-20 seconds, until the screen powers off then an Apple logo appears, which signifies a reboot. Some users have (oddly enough) reported that performing two hard resets resolves the slowness issue.
Restore, but not from backup. It appears that bad holdover data from iPhone backups can cause performance problems. Restoring as a new phone will delete contacts and other data, but may resolve this issue.
To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”
Free up space. Make sure that your iPhone has at least 10% of its available memory free. OS X-based systems, such as iOS 4.0, may require some free space to operate properly.
Close open Safari windows. One iOS application that consumes memory in the background is Safari. Close all unused windows in the application by pressing the page switch button in the lower right portion of the screen then clicking the X at the top left of each page.
Some users have reported an issue in which iTunes displays the error message “The iPhone “name of iPhone” could not be restored. An unknown error occurred (29)” when attempting to update to iOS 4.0, or perform a restore on an iOS 4.0 device.
This issue appears to affect primarily users who have replaced their batteries or some other hardware components through a service such as iFixit. Error 29 indicates a hardware issue, which means that iOS 4.0 may be (accurately or not) triggering some compatibility issues with after-market add-ons or replacements.
Fix
Some users have been able to resolve this issue via the use the utility iRecovery. Instructions are here.
A number of iPhone users have reported loss of cellular data access (3G or EDGE) after the update to iOS 4.0.
Fixes
Reset all settings. Try this first. On your iPhone, select Settings, then Reset, then Reset All Settings. This will result in the loss of data created since your last backup, but may solve the problem.
Restore, but not from a backup. One less-than-ideal fix for this issue involves restoring the iPhone as a new device rather than from a backup. It appears that bad holdover data from iPhone backups can cause loss of data access. Restoring as a new phone will delete contacts and other data, but generally resolves this problem.
To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”
Download new carrier settings. On your iPhone, go to Settings > General > About. If prompted for a carrier settings update, install it.
Otherwise, go to http://www.unlockit.co.nz/unlockit/ on your iPhone and download new carrier settings.
Apple’s fixes Apple has also published two knowledge base articles on this issue.
- “Using custom APN and unable to use Cellular Data Network services after upgrading to iOS 3.x or iOS 4 or later“ states: “If you did not edit the Cellular Data Network settings prior to installing iOS 3.x or iOS 4 on your iPhone and you are unable to use Cellular Data Network services, try turning off and then turning on iPhone. If the issue persists, contact your carrier about the availability and provisioning of these services on your wireless account” and offers instructions for changing APN settings.
- “Troubleshooting MMS” states: “you may encounter the following issues: You are unable to receive MMS messages; […] A red exclamation mark appears next to MMS messages you send” and offers a number of fixes.
Some users have reported that the iPod app on the iPhone crashes after the iOS 4.0 update. These users report that the app crashes on launch, or while it is running in the background. In other cases, songs will simply stop playing midway, although the iPod app does not crash completely.
Fixes
Turn off Spotlight for audio files. Navigate to Settings -> General -> Home Button -> Spotlight Search Results and deselect Music, Podcasts and Audiobooks.
Don’t sync podcasts. In some cases, it appears that problematic podcast files may be to blame for this issue. Deselect podcasts for syncing in iTunes, then re-sync your iPhone.
Switch to manual sync. After performing the aforementioned fixes, try switching to manual syncing in iTunes. To do so, select your iPhone from the left-hand pane in iTunes, then click the Summary tab and select “Manually manage music and videos”.
Restore, but not from backup. It appears that bad holdover data from iPhone backups can cause this problem in some cases. Restoring as a new phone will delete contacts and other data, but may resolve this issue. To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”
iPhone Reboots/Resets During Phone Calls
Some users have reported an issue in which the iPhone repeatedly reboots in the middle of phone calls. Afflicted users reported that the phone simply restarts anywhere from 1 to 5 to 10 minutes into calls.
Potential fixes
Reset network settings. On your iPhone, open Settings, then navigate to “General” in the left-hand pane. Scroll down and tap Reset, then select “Reset Network Settings.” This will delete any stored WiFi passwords and other information, but may result in a more stable connection.
Restore, but not from backup. Although this fix is not universally successful, some users have reported relief via restoring the iPhone as a new device rather than from a backup. It appears that bad holdover data from iPhone backups can cause the reboot problem. Restoring as a new phone will delete contacts and other data, but may resolve this problem.
To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”
A few users have reported loss of iPhone Wi-Fi connectivity after the update to iOS 4.0. In these cases, the Wi-Fi option in the iPhone’s Settings app may be grayed out.
Potential fixes
Turn router off then on Try turning your wireless router off then back on.
Change or turn off wireless security You may want to try toggling the settings on your wireless router, switching from WPA to WEP or vice versa, or, as a last resort, turning wireless security off altogether. For AirPort routers, this can be accomplished with the AirPort Admin Utility. For other routers, this can usually be accomplished by accessing the router’s configuration page — open a browser and enter the address 192.168.1.1.
Reset network settings on iPhone. On your iPhone, open Settings, then navigate to “General” in the left-hand pane. Scroll down and tap Reset, then select “Reset Network Settings.” This will delete any stored WiFi passwords and other information, but may result in a more stable connection.
Restore, but not from a backup. One less-than-ideal fix for this issue involves restoring the iPhone as a new device rather than from a backup. It appears that bad holdover data from iPhone backups can cause loss of data access. Restoring as a new phone will delete contacts and other data, but generally resolves this problem.
To do so, connect your iPhone or iPod touch to your computer, click “Restore” in iTunes, then choose “setup as new phone.”
Update Stuck on Backup or Extremely Slow
Several users have reported an issue in which the iPhone and iPod touch become indefinitely stuck on the backup phase of the iOS 4.0 Update. Other users report that the backup process is inordinately slow after the update, taking up to 3 hours in some cases.
Fixes
Disable network connection. In some cases, simply disabling your network connection (turning off AirPort or unplugging your Ethernet cable) will resolve the slow or stuck backup phase. It appears that iTunes performs some data network data transfer during the backup process which can, for unknown reasons, take an extremely long time or become stalled.
Restore instead of update. Backup your iPhone or iPod touch, then perform a restore process instead of using the check for update function. This may allow the iPhone or iPod touch to successfully receive the iOS 4.0 update, after which sync processes should occur at normal speed.
Switch USB ports. Try switching your iPhone or iPod touch to a different USB port. In particular, if you are using a hub or other intermediary device, try connecting the device directly to your computer.
Some users have reported an issue in which iPhones fail to sync with iTunes 9.2. In these cases, sync attempts result in the error message “The iPhone (name) cannot be synced. A duplicate file name was specified.” This problem may be accompanied by duplication of music and other media files.
Fixes
There are two potential fixes for this issue:
Remove iToner or updateAs noted in our previous report on iTunes 9.2 syncing problems, appears that the presence of Ambrosia Software’ iToner software may cause problems with syncing. Navigate to /Library/iTunes/iTunes Plug-insand/Library/iTunes/iTunes Plug-ins (the Library folders inside your user folder and at the root level of your startup drive) and look for a file called iTonerSupport.bundle. Remove it, then restart, and check to see if iPad syncing occurs more quickly.
Updating to iToner 2.0.6 may also resolve this issue.
Turn off note syncing. In iTunes, navigate to the info tab and deselect the option to sync notes, then sync your iOS device. You may need to do this each time you sync.
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