Specifications

iPhone 4 Symptom Charts — Connectivity Issues 66
2012-02-21
7. Restore with iTunes.
Restore the device using
the latest version of iTunes.
If restore fails, attempt DFU
restore.
Is the cellular issue resolved?
Yes Issue resolved.
No Determine if the issue is caused by
accidental damage. Refer to the Visual
Mechanical Inspection guidelines.
Cellular Data Issues
Known-Good Parts & Materials Required: SIM card, SIM removal tool, USB Power Adapter,
Dock Connector to USB Cable, computer running the latest version of iTunes with a known-
good USB port
Also see Apple Support article HT1976: iPhone: Understanding cellular data networks.
Quick Check
Symptoms Quick Check
• Cannot load web pages
• Cannot send or receive email
• Cannot send or receive cellular
data, such as maps, weather,
stocks
1. On the device, go to Settings and turn Airplane
Mode on for 15 seconds, then o. This resets all
wireless connections on the device.
2. Restart the device.
3. On the device, go to Settings > General >
Software Update to verify device has the most
up-to-date software. If unavailable, verify by
plugging the device into iTunes.
4. If the device is in a case, remove it from the case.
Power o (red slider) and back on. See Apple
Support article HT2342: iPhone: Signal or other
interference while in carrying case.
5. If there is not at least one bar of cellular signal
strength, try moving to another location and
check for a better signal.
6. If the issue is with email, verify that the user’s
email account credentials are accurate.
7. Turn o Wi-Fi (Settings > Wi-Fi) in order to isolate
the issue to carrier network activity.