On June 21, we noted that a number of iPhone users have reported loss of cellular data access (3G or EDGE) and MMS capabilities after the update to iOS 4.0. We offered a number of fixes, including reapplication of carrier APN settings, which was successful for most readers.
Apple has now 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.