iPhone 12: Weird VF network behaviour

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#2711635 23-May-2021 10:46

Just read this thread, exact same problem. iPhone 12, few issues southbound, but rubbish northbound after tunnels, ie 3G with full bars but no connectivity.

Will be popping in for new SIM tomorrow, thanks!

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#2711637 23-May-2021 10:49

dafman:

Just read this thread, exact same problem. iPhone 12, few issues southbound, but rubbish northbound after tunnels, ie 3G with full bars but no connectivity.

Will be popping in for new SIM tomorrow, thanks!

@dafman How will a new SIM help? No way a new SIM card could help with this issue

dafman

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#2711639 23-May-2021 10:55

Linux:

dafman:

Just read this thread, exact same problem. iPhone 12, few issues southbound, but rubbish northbound after tunnels, ie 3G with full bars but no connectivity.

Will be popping in for new SIM tomorrow, thanks!

@dafman How will a new SIM help? No way a new SIM card could help with this issue

Just reading previous posts in thread:

VF say: "we need to upgrade your sim card. The older sim cards have an outdated net protocol which is affecting how the phone connects to the network."

@jjnz1 follows up with: "Got a new 64012003xxx sim and issue gone. iPhone is way more aggressive with 4G too, only <30s on 3G then straight back to 4G. Data when connected to 3G now works. Phone connected fast between tunnels too"

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#2711640 23-May-2021 10:59

This is not controlled by the SIM card but the RAN

alasta

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#2711703 23-May-2021 12:38

It seems unlikely, but maybe they've fixed it on the network side and it's coincidence that the timing lines up with the OP replacing their SIM?

I'll test it this week and report back.

jjnz1

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#2712812 25-May-2021 11:52

So UPDATE.

I have reopened the Vodafone ticket, as my issue has improved but I am still getting connectivity issues outside Takapu Station while connected to 3G.

I have sent them through screenshots with timestamps showing full 3G coverage but no data connectivity. And once 4G is back, data flows again.

I have removed the 'answer' tag from my previous post too.

Will provide an update once I hear back.

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#2712813 25-May-2021 11:55

So not a SIM card issue as advised earlier on Network issue

alasta

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#2712974 25-May-2021 19:29

I just did a test heading north tonight. Between the tunnels and Redwood station my iPhone alternates between 3G and 4G a few times. When it's on 3G it appears to lose its connectivity, but data flows immediately when it switches to 4G.

So, I can confirm that the problem still persists without a SIM change, and it sounds like a SIM change is also a red herring.

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#2712992 25-May-2021 21:09

It would have been great if it was just the SIM card. Unfortunately despite all the great advice from here you are still at the mercy of the telcos fault finding process.

VF left me a message today, they want to tag or log my phone to try and find the fault, so what ever that is I will call them tomorrow and get that process started.

Long road ahead me thinks.

I advise other VF customers who are having the same issue to log the problem with the Helpdesk referring to this thread.

jjnz1

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#2713326 26-May-2021 17:04

Vodafone ticket number if you would like to reference when you lodge a similar fault

Hello, the reference number for your fault is INC000002884419. Thanks

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#2713338 26-May-2021 18:17

While on 4G, what happens when you go into Settings -> Phone ->Call Forwarding?

You should get a spinning circle for maybe 3 seconds then have the option to turn it on appear. If it never loads then ring Vodafone and ask them to enable 4G on your mobile

Based on many examples, Vodafone do not automatically enable that on moves from other networks. I’m advised that it’s a manual process for them.

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#2713372 26-May-2021 19:18

It's not a 4G problem. 4G is working fine, but there is no data throughput over 3G when handing over from 4G in this isolated location.

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#2713374 26-May-2021 19:19

I can confirm SIM red herring. No change. No connectivity on 3G (full bars) north of tunnel. Occasional 4G, but problem pretty much persists through to Pram.

(This, despite Vodafone LQ saying they have done quite a few SIM swaps for this issue and it seems to help, but couldn’t tell me why).

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#2713403 26-May-2021 20:18

Interesting. I generally don't have a problem north of Redwood station, but I live in Plimmerton so I don't have any experience north of there.

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#2713535 27-May-2021 07:59

alasta:

Interesting. I generally don't have a problem north of Redwood station, but I live in Plimmerton so I don't have any experience north of there.

It cuts in and out of 4G and 3G all along the route. But 3G is next to useless, often refusing to load at all, or is very slow. My prior phone, Galaxy S10e was fine on the train. I’m out of the region at the moment, but wonder if the 14.6 update will assist as there was a modem fix from what I understand.

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