Visual Voicemail fails on iPhone 5 with AT&T when APN config profile installed

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Visual Voicemail fails on iPhone 5 with AT&T when APN config profile installed

Installing a configuration profile containing APN information to the new AT&T iPhone 5 results in breaking the capability to use the Visual Voicemail feature of the Phone app on the device. What this means is that we cannot do these things: receive indication for new voicemail and change the Greeting from Default to Custom and vice versa. A popup comes up saying it cannot connect to the server. These operations involve network activity and this connection does not happen when the config profile with APN is installed to the device.

This happens regardless whether the device is on LTE mode or on 3G mode.

The configuration profile we are using has APN information and proxy settings for this APN as well (proxy host and port information). However, the problem happens even if the profile contains just APN without any proxy settings info.

This happens on iPhone 5 ONLY (commercially available through AT&T). This is important to note because iPhone 4S with iOS 6 DOES NOT HAVE THIS PROBLEM.

iPhone 4S, iOS 5

Posted on Oct 6, 2012 8:35 PM

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Answer 1

diesel vdub

Level 7

22,178 points

Oct 7, 2012 5:42 AM in response to onecount

Contact AT&T to confirm the APN settings are correct.

I personally find it difficult to believe that what you describe is hardware related.

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Answer 2

onecount Author

Level 1

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Oct 26, 2012 6:58 PM in response to diesel vdub

which APN settings? the visual voice mail ones? why would they be affected by the profile? if they are, it is a bug. This is a commercial device. It comes pre-configured with the correct settings for VVM. If installing the profile messes up these settings, it is a bug in my view.

Recall that iPhone5 is LTE-capable, maybe the way the APNs are engaged for different types of traffic is different for this hardware.

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Answer 3

KiltedTim

Level 10

195,159 points

Oct 27, 2012 4:45 PM in response to onecount

WHY would you be installing custom APN settings for an iPhone on AT&T? It contains the correct settings. All you can do by trying to change them is mess things up.

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Answer 4

onecount Author

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Oct 27, 2012 5:42 PM in response to KiltedTim

we need this for our enterprise deployment. We require to use a proxy server too. This is our enterprise requirement. We had no issue before iPhone5 (at least not with AT&T devices).

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Answer 5

KiltedTim

Level 10

195,159 points

Oct 27, 2012 6:34 PM in response to onecount

Have you tried it on any other devices running iOS 6?

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Answer 6

onecount Author

Level 1

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Oct 27, 2012 6:56 PM in response to KiltedTim

So, here is where we saw this problem:

USA:

Verizon and Sprint, pre-iPhone5, iOS 5 and iOS 6

Sprint and AT&T, iPhone5 (and of course iOS 6)

Japan (we have a deployment there as well):

SoftBank: all iPhones (iOS 5 and iOS 6)

KDDI: pre-iPhone5 (iOS 5 and iOS 6). iPhone5 has not been tried on this carrier by my team yet.

Please note that whenever we have the VVM issue, we also have MMS (Multimedia Messaging, not iMessage) being blocked (not working) at the same time. It seems that they (MMS and VVM) either both work together or they are both blocked together when we do our APN proxy.

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