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Old 26.10.2015, 10:06
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Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

Swisscom and Salt have activated Wi-Fi calling for iPhones last week. This is causing issues with battery usage and phones getting hot. If anyone, like me, is having the issue, the way to fix it is to go back to the previous version of carrier settings on the iPhone. If you have not enabled Wi-Fi calling at this time, do not do so until this is fixed.

1. Activate "Carrier-Testing" for iTunes (from a command line in Windows or terminal window in OS X):

OS X: defaults write com.apple.iTunes carrier-testing -bool YES
Windows: %ProgramFiles%\iTunes\iTunes.exe" /setPrefInt carrier-testing 1

2. Restart iTunes

3. Download the old carrier bundle version:

Swisscom
Salt

4. Start iTunes, click on "Check for updates" while holding the alt key (on Mac) or ctrl key (on Windows) and select the carrier bundle downloaded in step 3.

When the phone asks you to update the carrier settings, select "Not now" or the issue will come back. A permanent fix will probably have to wait for an update from Swisscom / Salt.

Hope this can help somebody, I spent the whole weekend wondering why my phone was going crazy until I finally read about this issue and workaround.
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Old 28.10.2015, 02:10
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

Thank you!
I was suspecting this feature, when found in battery usage report that 50% of battery used by Settings(??), but now I have proof, that I'm not the only one
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Old 28.10.2015, 10:05
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

I haven't activated WiFI calling yet, but to be honest between Swisscom and Apple, iOS9, especially 9.1, has been a pretty rough experience for me on my iPhone 6.

First off the Swisscom carrier settings that I accepted just after I installed iOS9 have prevented me from forcing the iPhone to just use the 2G network. Why is this so much of a problem? Well in my flat I get very little signal, so what happens now is that the phone is constantly switching between 3G, edge, no data connection, no service, and so on and so on. This means that if I forget to turn the phone off, or put it into flight mode, I wake up to a dead phone. This wasn't a problem when I could force the phone onto the 2G network.

As for iOS 9.1, well often when 4G has activated then the entire baseband hangs - no data, no voice, nothing, and the only thing that will bring it back is a reboot. I've had the Home and Lock screen devour 50% of the battery in 2 or 3 hours. The settings will also often freeze for about 15 to 20 seconds after turning something on or off. I can say that in 7 years of owning iOS devices this has been by far the worst experience I've had.

I suppose the next step is a complete DFU restore, but I not overly enthusiastic of having to reload around 80 Gigs of data.
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Old 28.10.2015, 11:36
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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I haven't activated WiFI calling yet, but to be honest between Swisscom and Apple, iOS9, especially 9.1, has been a pretty rough experience for me on my iPhone 6.

First off the Swisscom carrier settings that I accepted just after I installed iOS9 have prevented me from forcing the iPhone to just use the 2G network. Why is this so much of a problem? Well in my flat I get very little signal, so what happens now is that the phone is constantly switching between 3G, edge, no data connection, no service, and so on and so on. This means that if I forget to turn the phone off, or put it into flight mode, I wake up to a dead phone. This wasn't a problem when I could force the phone onto the 2G network.

As for iOS 9.1, well often when 4G has activated then the entire baseband hangs - no data, no voice, nothing, and the only thing that will bring it back is a reboot. I've had the Home and Lock screen devour 50% of the battery in 2 or 3 hours. The settings will also often freeze for about 15 to 20 seconds after turning something on or off. I can say that in 7 years of owning iOS devices this has been by far the worst experience I've had.

I suppose the next step is a complete DFU restore, but I not overly enthusiastic of having to reload around 80 Gigs of data.
First try the suggestion above, it looks like most issues are linked to the carrier bundle rather than iOS itself. My phone is working perfectly fine after downgrading to the 22.0 CB. 22.1 is the version with issues.
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Old 28.10.2015, 12:14
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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First try the suggestion above, it looks like most issues are linked to the carrier bundle rather than iOS itself. My phone is working perfectly fine after downgrading to the 22.0 CB. 22.1 is the version with issues.
A quick check shows that 22.1 is indeed the malware that Swisscom appears to have infected my phone with.

Thanks for the above solution.
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Old 28.10.2015, 13:31
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

I appreciate reading your Carrier Settings dowgrade hack, but out of curiosity, did you try to simply switch off the WiFi Calling uption in the Phone part of Settings ?
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Old 28.10.2015, 14:02
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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I appreciate reading your Carrier Settings dowgrade hack, but out of curiosity, did you try to simply switch off the WiFi Calling uption in the Phone part of Settings ?
Yes, of course. I should have been more specific: once wi-fi calling has been activated, there is no other known way to fix the issue, other than the above "hack" or disabling iCloud. I did not try the latter but only read about it, and I am not sure how iCloud is connected to the issue.

My info comes from the German Swisscom support community thread: http://supportcommunity.swisscom.ch/...-1/td-p/405197. Today, Swisscom has also announced there that a fix is on its way.
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Old 28.10.2015, 14:09
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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Yes, of course. I should have been more specific: once wi-fi calling has been activated, there is no other known way to fix the issue, other than the above "hack" or disabling iCloud. I did not try the latter but only read about it, and I am not sure how iCloud is connected to the issue.

My info comes from the German Swisscom support community thread: http://supportcommunity.swisscom.ch/...-1/td-p/405197. Today, Swisscom has also announced there that a fix is on its way.
Many thanks ! I just followed your suggestion to downgrade (btw, for windows iTunes it's Shift-"Check for updates" and not CTRL, but other then that it worked smooth ! Thx again!
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Old 28.10.2015, 21:57
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

Swisscom has released CB 22.2 and it seems the issue is now resolved.
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Old 28.10.2015, 22:58
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

Salt has also released such update and so far people in their forums said it has been working...
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Old 28.10.2015, 23:40
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

Hi Greg

Thank you so much for the solution. You saved my day! Without knowing what was going on, i even factory reset my iPhone. Now it is back to normal. By the way what is the faulty carrier version of SALT? Is it 22.1?

Regards

Priyan
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Old 29.10.2015, 09:24
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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Hi Greg

Thank you so much for the solution. You saved my day! Without knowing what was going on, i even factory reset my iPhone. Now it is back to normal. By the way what is the faulty carrier version of SALT? Is it 22.1?

Regards

Priyan
Thx Greg!

Swisscom => 22.2, heat issue gone, can't yet test WiFi Calling as my line has not been migrated yet to the new platform and
Salt => 22.2, fine too, here WiFi calling works fine, even as fine that it was not easy to find out if the call was cellular or WiFi. Rebooting my WiFi router mid-call solved that question mark, the call was really going over WiFi.

Does anyone know when Salt is enabling VoLTE ?!? And for the people that use already VoLTE on Swisscom, is it as transparent as the WiFi calling ? Can you hear the difference ? Do you see the name of a person calling you when not in the phone book ?!?
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Old 29.10.2015, 11:36
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

It might not be clear to people how to install this carrier update immediately so either:

1. Connect the phone to iTunes and you'll be informed that there's a new carrier update and install from there.

or

2. On the phone go to Settings -> General -> About (Einstellungen -> Allgemein -> Info). Wait a few seconds and then there'll be a pop up asking you to either install now or later.

Edit: The process is the same regardless of whether you're on Swisscom or Salt.
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Old 01.11.2015, 00:32
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

My wife has an iPhone 4 on Swisscom, I have a 6 on Salt. My battery life has also recently been worse than normal, and my wives dreadful. I have looked at the carrier setting for my phone and it saysSalt 21.1 and I can't see how to update this. I do have the message to update my & to IOS9.1 do I have to do this 1st? And following the step^s about don't seem to do anything.

An explanation suitable for a 5 year old child would be good, as when it comes to this.... that's about my lvl. I have downloaded the carrier setting above to my iMac, and connected to iTunes, but the only update option I have is for IOS 9.1?
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Old 01.11.2015, 11:19
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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My wife has an iPhone 4 on Swisscom, I have a 6 on Salt. My battery life has also recently been worse than normal, and my wives dreadful. I have looked at the carrier setting for my phone and it saysSalt 21.1 and I can't see how to update this. I do have the message to update my & to IOS9.1 do I have to do this 1st? And following the step^s about don't seem to do anything.

An explanation suitable for a 5 year old child would be good, as when it comes to this.... that's about my lvl. I have downloaded the carrier setting above to my iMac, and connected to iTunes, but the only update option I have is for IOS 9.1?
The carrier update is specifically intended for WiFi calling. As this is only supported on 9.1 my guess is that you'll need to update to 9.1 before you'll be able to install the carrier update.

This won't apply to your wife's iPhone 4 as this can only support iOS 7. If the battery on the life on the 4 has become terrible then the chances are, given the age of the phone, that the battery itself is no longer in a good condition.
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Old 01.11.2015, 11:33
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

Thanks for the reply. I thought that may be the case for her, but it's life just fell off a cliff on thurs/friday, With no usage, bluetooth off & 3g off the phone was taken off charge at 11 am yesterday and was dead when my wife went to it at 09:15 this morning. If the battery is toast, can it be replaced or is it a new phone for her?

For my for my 6 month old iphone 6, what causes could there be for the recent decrease in battery life. No real change in usage, and it spends its life on wifi or edge, I rarely use 3 or 4g, and would you recomemd the IOS upgrade to IOS 9.1?
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Last edited by Papa Goose; 01.11.2015 at 11:44.
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Old 01.11.2015, 11:47
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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Thanks for the reply. I thought that may be the case for her, but it's life just fell off a cliff on thurs/friday, With no usage, bluetooth off & 3g off the phone was taken off charge at 11 am yesterday and was dead when my wife went to it at 09:15 this morning. If the battery is toast, can it be replaced or is it a new phone job?
It can be replaced - there's a place in Zürich HB where you can take the phone, but first go to Settings -> General -> Usage -> Battery Usage. If the standby time and usage time are equal or close to being the same then the problem is likely to be a software problem and replacing the battery won't bring you much. If on the other hand the there's very little usage time compared to standy time then the chances are high that the battery has given up the ghost.

That said the iPhone 4 is now a old model and is no longer being supported with updates, including security updates, so it might be time to think about a new phone. It was after all introduced in 2010 and a five year run with a phone these days is a good innings.

Edit: I've had a few problems with my 6 on iOS 9 - The battery should still be in good condition, so my advice would be to check the battery usage - Settings -> Battery to see how much usage time it's had. In my particular case it was the Home and Lock screen killing my battery, and after restarting the phone the problem appears to be resolved. It does pay to power off and power on the phone from time to time.
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Old 01.11.2015, 12:03
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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It can be replaced - there's a place in Zürich HB where you can take the phone, but first go to Settings -> General -> Usage -> Battery Usage. If the standby time and usage time are equal or close to being the same then the problem is likely to be a software problem and replacing the battery won't bring you much. If on the other hand the there's very little usage time compared to standy time then the chances are high that the battery has given up the ghost.
Her phone reads usage 16h 53, abd Stby 17hr 9.
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Old 01.11.2015, 12:20
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

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Her phone reads usage 16h 53, abd Stby 17hr 9.
That's almost certainly a sofware problem. Close all running apps (double tap on the home button, and then swipe up on each app to close). Leave the phone a minute or so, there are technical reasons* for this, and then reboot the phone.


*The reasons for waiting is to give the phone time to clear the app cache and update the "open app" database. Often if you reboot the phone directly after closing a load of apps, those apps will then automatically launch again. However leaving the phone a minute or to let it do it's housekeeping will stop this from happening.
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Old 02.11.2015, 18:25
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Re: Swisscom / Salt - High battery usage with Wi-Fi Calling on iPhone

Hello,

I just updated my Swsscom iPhone6 to carrier settings 22.2 and I almost fell the phone cool down.

Before the update, the phone would be almost too hot to touch as I was listening to Apple Music via wifi. Plugged-in, the phone was barely able to maintain it's charge.

Now it's back up to 100%, still listening to Apple Music, and the phone is cool to the touch.

Hope this helps,

Michel
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