WiFi Calling Power Savings

hypno

macrumors regular
Original poster
Oct 30, 2012
181
1
My iPhone 6 Plus tears through battery pretty fast compared to recent phone like my Note 3 or LG G3. I'd say about half as good so far. I could regularly go 24 hours without having to charge these devices - sometimes 36 hours - however the iPhone 6 Plus is more like 12 hours.

One thing I am curious about is it appears a difference betwen Android and iOS WiFi calling is my Android devices actually disable the LTE modem. However, on iOS I still see the signal moving between 1-2 bars, etc. It replaces LTE/4G with WiFi, but the bars aren't "disabled" like they are on Android. Does iOS not disable this? More importantly are there not any power savings advantage to WiFi calling if so?

Where I live / work, the T-Mobile signal can be weak and rotate between Edge, 4G, and 4G LTE...it seems to me the low signal is the only thing that could be draining the battery so much as otherwise my usage characteristics have been similar to the above devices.
 

0970373

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Mar 15, 2008
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I think the phone is still searching for a cell signal even if WiFi calling is on/activated. Probably so that the transition, should you move out of range is seamless. I've started putting my phone in airplane mode w/ WiFi when I'm at work or at home. That's helped w/ battery.
 

Orlandoech

macrumors 68040
Jun 2, 2011
3,339
871
Salt Lake City, UT
I think the phone is still searching for a cell signal even if WiFi calling is on/activated. Probably so that the transition, should you move out of range is seamless. I've started putting my phone in airplane mode w/ WiFi when I'm at work or at home. That's helped w/ battery.
You're still able to make/receive calls and text this way?
 

Orlandoech

macrumors 68040
Jun 2, 2011
3,339
871
Salt Lake City, UT
Ah, it is carrier specific I believe. You'd have to check with whichever carrier you use. :)

I'm on T-Mobile and can confirm that, yes, wi-if calling does indeed work. Nicely too.
I am on T-Mobile too, I just wasnt sure if AT$T or Verizon enabled it, but I don't think they have.
 
Last edited by a moderator:

hypno

macrumors regular
Original poster
Oct 30, 2012
181
1
I think the phone is still searching for a cell signal even if WiFi calling is on/activated. Probably so that the transition, should you move out of range is seamless. I've started putting my phone in airplane mode w/ WiFi when I'm at work or at home. That's helped w/ battery.
This makes sense. I suppose the transition wouldn't work without it functioning this way.

Airplane mode with WiFi enabled makes sense. I've been away from iOS for awhile, but I take it there isn't any type of app where I could automate this? The only two networks I'd really be concerned about this are work and home, and it would be nice to automate Airplane mode on, WiFi on when I join these networks (of course Airplane off when I disconnect). I'm guessing this is not possible..
 

Woochifer

macrumors 6502a
Apr 22, 2007
687
0
I don't know if it's because of wi-fi calling, but after upgrading to iOS 8, I have noticed a reduction in the power drain with my phone on standby. The standby power drain was actually something that I thought got worse after installing iOS 7.1.
 

0970373

Suspended
Mar 15, 2008
2,727
1,407
You're still able to make/receive calls and text this way?
Yep. With TMobile. It's why I switched.

----------

This makes sense. I suppose the transition wouldn't work without it functioning this way.

Airplane mode with WiFi enabled makes sense. I've been away from iOS for awhile, but I take it there isn't any type of app where I could automate this? The only two networks I'd really be concerned about this are work and home, and it would be nice to automate Airplane mode on, WiFi on when I join these networks (of course Airplane off when I disconnect). I'm guessing this is not possible..
I don't think so. I don't know of any way at least. But it takes a flick and a tap to turn it all on/off.
 

hypno

macrumors regular
Original poster
Oct 30, 2012
181
1
I think the phone is still searching for a cell signal even if WiFi calling is on/activated. Probably so that the transition, should you move out of range is seamless. I've started putting my phone in airplane mode w/ WiFi when I'm at work or at home. That's helped w/ battery.
Airplance mode with WiFi is making a huge difference today. 2-3x improvement in battery drain.

Is this something an extension could do perhaps? i.e. thinking a toggle in notification panel to enable airplane and then enable wifi and bluetooth with one click.
 

0970373

Suspended
Mar 15, 2008
2,727
1,407
Airplance mode with WiFi is making a huge difference today. 2-3x improvement in battery drain.

Is this something an extension could do perhaps? i.e. thinking a toggle in notification panel to enable airplane and then enable wifi and bluetooth with one click.
There's no extension needed. Just flick up the control panel, tap Airplane/WiFi/BT or whatever you'd need.
 
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