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jjnz1

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#285803 18-May-2021 18:55
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Hey folks

 

 

 

Finally having moved from Android to iPhone, I am experiencing some wierd network behaviour with my iPhone 12 Max on the VF network.

 

(I've been on Android since the Nexus S days and am loving the iPhone)

 

 

 

Does someone know of a fix or should I escalate to Vodafone?

 

 

 

Problem:

 

While on the Kapiti Train between Takapu Station and the main train tunnel, my iPhone drops down to 3G.

 

I understand from other posts, the iPhone favour strong 3G over 1 bar 4G (mistake if you ask me), and my phone does drop down to full bars 3G.

 

However while on 3G there is no connection at all on any app (browser, whatsapp, messenger, etc) despite full bars.

 

This happens without fail every time, and lasts in the same locations. 

 

 

 

Temp Solution:

 

If I turn on flight mode, then turn it off straight away, the phone then reconnects to 4G (1 or 2 bars) and all is happy.

 

 

 

Unconfirmed:

 

My phone doesn't drop down to 3G very often, so I can't confirm if the issue is just related to this location.

 

I haven't tried calling during this time actually - will do tomorrow.

 

 

 

What have I tried unsuccessfully:

 

  • Changed 5G setting from on to auto to off
  • Toggled roaming
  • locked to Vodafone
  • changed to auto provider
  • toggled enable data during issue
  • restarted phone
  • waited

I am positive 3G works elsewhere, but I cannot recall any exact moments. I will keep an eye out for it over next few days.

 

 


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MaxineN
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  #2709169 18-May-2021 19:04
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See this thread.

 

 

 

https://www.geekzone.co.nz/forums.asp?forumid=76&topicid=284539

 

 

 

Very much like the behaviour you're seeing.





Ramblings from a mysterious lady who's into tech. Warning I may often create zingers.


 
 
 

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jjnz1

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  #2709182 18-May-2021 19:26
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Na I looked at that. Although annoying I am happyish that the iPhone prefers strong 3G over weak 4G. That is not the problem here. 

 

Having an iPhone with full 3G bars but no data connectivity is the issue. 


MaxineN
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  #2709183 18-May-2021 19:28
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Does 3G work right now where you are?





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Linux
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  #2709184 18-May-2021 19:30
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This is not a iPhone issue but carrier side


alasta
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  #2709186 18-May-2021 19:37
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I use the same train every day and I experience the same thing on my iPhone XS Max.

 

When southbound on the train my device behaves as I would expect; it works fine up to the tunnels, then dies, then reconnects almost immediately on the city side of the tunnels.

 

When northbound on the train I lose connection when entering the tunnels, however I generally don't get it back until I reconnect to 4G somewhere around Redwood station. 

 

I always assumed it was a network configuration issue, but it's interesting that you didn't experience the same problem when you had a different brand of phone. 


RunningMan
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  #2709189 18-May-2021 19:42
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alasta:

 

[snip] it's interesting that you didn't experience the same problem when you had a different brand of phone. 

 

 

Probably because the iPhone is more aggressive at changing to 3G for a stronger signal, and other brands hang on to a lesser 4G signal, and 4G is still working in that area, whereas 3G may not be.


RunningMan
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  #2709197 18-May-2021 20:01
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And looking at the coverage map, there seems to be good 3G coverage, and patchy 4G, so it's no surprise the iPhone is changing. Try logging a fault with VF.




jjnz1

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  #2709241 18-May-2021 20:02
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Bear in mind I have almost full (4) 3G bars all the way from Takapu to the tunnel yet no data connectivity.

I didn’t experience this on my S10+.

@MaxineN Right now at home I have 1-2 bars of 4G. No idea how to force it to 3G (don’t think you can on iPhone)

@Alasta check to see if your phone is connected via 3G , sounds very similar to mine.

Looks like I might be raising this with my VF account manager if it’s not just me 😁

If anymore people have this issue too post here and I will use this post as ammo 😁

alasta
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  #2709299 18-May-2021 20:36
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jjnz1: check to see if your phone is connected via 3G , sounds very similar to mine.

 

I can confirm that it's on 3G when I lose connectivity between the tunnels and Redwood station, but only when northbound. When I am southbound in that location it appears to work fine right up to the tunnels.

 

So, from my experience, it appears to be a network issue that occurs only when the iPhone connects to the 3G signal after leaving the tunnels. Is this consistent with what you're seeing?


michaelmurfy
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  #2709314 18-May-2021 21:04
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It also isn't just Vodafone, it affects all providers just before the tunnel. Spark I find is the worst for this (often you get the 3G Friendzone just past Tawa) and 2degrees I find to be the best of the 3 holding onto 4G right until the bitter end (very close to the tunnel). I'm also using an iPhone 12 Pro Max and before that experienced it on the iPhone XS Max.

 

As others said, I think the iPhone is more aggressive with keeping a stable signal. This has always been the way since I've been using an iPhone and I too noticed it being a touch more aggressive than my last Android phone.





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jjnz1

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  #2709459 19-May-2021 08:30
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alasta:

jjnz1: check to see if your phone is connected via 3G , sounds very similar to mine.


I can confirm that it's on 3G when I lose connectivity between the tunnels and Redwood station, but only when northbound. When I am southbound in that location it appears to work fine right up to the tunnels.


So, from my experience, it appears to be a network issue that occurs only when the iPhone connects to the 3G signal after leaving the tunnels. Is this consistent with what you're seeing?



Yes it is. Southbound there is a small section (800m) around Takapu station where my phone does drop down to 3G and data service stops.

I can confirm calling works even though data doesn't.

Just past Takapu phone switches back to 4G and all is fine.

I have escalated this to my account manager. Hopefully get some results.

jjnz1

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  #2709514 19-May-2021 10:56
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Just in from VF...

there is a known issue with new iPhones, IOS 14 and our network. Please make sure you are operating the very latest version of IOS, apple has loaded a patch as part of this. Second, 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.



We recommend getting a new Simcard, that starts with 64012003 … or later, prefer to 64012005… if you do not have one of these please drop into a retail store and request a new blank sim.

alasta
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  #2709516 19-May-2021 10:58
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I think iOS 14 might be a red herring because the problem was actually worse when I was on iOS 13.


jjnz1

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  #2709763 19-May-2021 17:24
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Solved!!

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

For future reference:
iPhone 12 Max Pro on 14.5.1
VF 64012003xxx SIM card
On business plan
Tested northbound





hio77
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  #2711587 23-May-2021 02:13
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I'd love to know what magic the sim had a bearing on. As it essentially sounds like that was simply a means to apply a newer carrier profile.




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Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.

 

 


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