After update 3.1 - 3G does not work after phone sits idle

Question

Updated from 3.01 to 3.1 - went smoothly, no problems. Restored my latest backup without issue. All is good. A few minutes later I tried to make a call and it failed. I tried to access the web - failed. Rebooted phone comes up as expected. Made a call, access to web working. 10 minutes later tried to make another call - failed; access to web failed again too. Switched over to Edge, rebooted. Calls and web access work. Waited 10-15 minutes, tried again; Edge still working. Switched back to 3G, rebooted. Same issue - calls/web work initially but after a short time, all calls and web access fail. I went through the 3.1 restore process again -- started over like it was a new phone. Again, the update worked without any issues/errors. I was able to restore my backup and all was good. But, same 3G problems occurred. So just for fun, I ran the Iphone config utility and captured the console log during a phone reboot sequence. After the phone booted up calls and web access were working with 3G. Then, let the phone sit idle for a while and saw these event occur in the log; the first 5 entries were made when I successfully sent a text message. After that message was sent I let the phone sit for a while. The next couple of entries were interesting. After the 'deactivated PDP context' messages appeared I could no longer make calls or access the web with 3G. Anyone else see this?
I never ever had this problem with 3.01 software.
Sat Sep 12 09:04:58 unknown com.apple.SpringBoard[25] <Notice>: told to send sms 867
Sat Sep 12 09:04:58 unknown CommCenter[29] <Notice>: queuing sms message with id 867
Sat Sep 12 09:04:58 unknown SpringBoard[25] <Error>: mms: queued messageId 867
Sat Sep 12 09:05:00 unknown com.apple.SpringBoard[25] <Notice>: internalID: [867]
Sat Sep 12 09:05:00 unknown com.apple.SpringBoard[25] <Notice>: notifying clients of event: 2 (recordID: 867)
Sat Sep 12 09:07:02 unknown CommCenter[29] <Notice>: Deactivating PDP context 1, because it has gone idle.
Sat Sep 12 09:07:43 unknown CommCenter[29] <Notice>: Deactivated PDP context 1 that supports connection types 0x2
Sat Sep 12 09:07:43 unknown configd[23] <Notice>: network configuration changed.
Sat Sep 12 09:07:43 unknown configd[23] <Notice>: CaptiveNetworkSupport:CaptiveHandlePrimaryChanged:2034 new primary: 67DCB7A6-30F5-4ECE-8FBB-5FC1DA71276D on pdp_ip0

Answer 1

I thought I'd post you a quick response because you described exactly the issues I was having. After my phone was idle for a while, my iPhone would refuse to get data over 3G.
I've tested this thoroughly and I'm able to "trip up" the phone into a state where it can't download data from the 3G network. But turning airline mode on for about 30 seconds then off again resets forces a renegotiate with the cell tower/3g and everything seems to work again about a minute later.
Nothing untoward listed in the console at this point either - The PDP context that you mentioned that was deactivated was more than likely the Internet Tethering. (It's usually PDP context 1, by the looks of things).
I think I might switch off 3G and see if that helps until Apple fix this issue. It is related to the wifi issues that others have reported - As I've seen my iPhone unable to download information via 3G if wifi is turned on, but you don't connect to a wifi network. But I can't seem to reproduce this reliably.
-Soen