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How Does Wifi Calling Work

Irishappletech

macrumors regular
Original poster
Aug 31, 2017
231
16
Hi. Am i correct to say that Wifi calling will work on the phone when it feels one of the 2 signals is better than the other essentially use whichever of the 2 signals is stronger so for example if my cellular connection is quite strong but at the time my wifi isnt will it use cellular signal to make the call over wifi calling or should it use wifi calling regardless

in short does the phone decide which is stronger for the call or does it prioritise Wifi calling over another. Ive noticed that my wifi calling doesnt always connect to my home wifi majority it does but sometimes it doesnt. also does wifi calling require a certain amount of internet wifi speed and bandwidth

Thanks

my Phone carrier is "Eir" who are an irish mobile operator
 

Irishappletech

macrumors regular
Original poster
Aug 31, 2017
231
16
yeah that what i thought the head of my carriers mobile department told me essneitlaly its up to the device to pick whichever signal is better if it deems one over the other to be better it will use that
 

Chazzle

macrumors 68000
Jul 17, 2015
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It depends on your carrier and which behavior they decide to use in their carrier firmware. For instance, T-Mobile used to always prefer WiFi calling if you had the setting turned on, but with the most recent carrier update that was introduced in I think 11.2.5, now WiFi calling only flips on if your cellular signal is 2 bars or less.
 

Chazzle

macrumors 68000
Jul 17, 2015
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2,010
I believe that also depends on the carrier as well and perhaps coverage in the area.

Even if I have good service, it doesn't seamlessly switch to the cellular network like Apple claimed in 2014.
C DM is right. It’s carrier dependent. T-mobile WiFi calling used to drop the call when they first introduced it, but now (past year) it switches to cellular with no problem.
 
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zorinlynx

macrumors 603
May 31, 2007
6,229
9,459
Florida, USA
My experience with AT&T has been that it depends on more than just signal level.

I suspect WiFi calling is used when the current cel tower is overloaded or not providing good service to the phone. I've seen WiFi calling active with full signal bars several times.
 
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Irishappletech

macrumors regular
Original poster
Aug 31, 2017
231
16
  • Yeah the seamless handover is enabled by my carrier either but it’s in the pipeline. Apparently it requires volte to work


  • My experience with AT&T has been that it depends on more than just signal level.
I suspect WiFi calling is used when the current cel tower is overloaded or not providing good service to the phone. I've seen WiFi calling active with full signal bars several times.
 

Statusnone88

macrumors 68000
Jun 19, 2010
1,546
780
  • Yeah the seamless handover is enabled by my carrier either but it’s in the pipeline. Apparently it requires volte to work


So for AT&T, you must be in an HD Voice (VoLTE) area and the call will hand off when you are leaving WiFi. If not, the call will drop.

Also, AT&T WiFi calling typically kicks in if signal bars are sub 3, but in high capacity areas, if your WiFi signal is reliable enough it’ll always default to WiFi calling.

I’d say my experience with WiFi calling has been pretty positive with AT&T.
 
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TiggrToo

macrumors 68040
Aug 24, 2017
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Out there...way out there
  • Yeah the seamless handover is enabled by my carrier either but it’s in the pipeline. Apparently it requires volte to work


Both both WiFi and VoLTE are forms of Voice over IP (VOIP) so you'd need to be able to transition from one network to another to make this seamless. Seamlessly transitioning from WiFi to CDMA\GSM just isn't possible since they're both totally different technologies.
 

az431

macrumors 68000
Sep 13, 2008
1,804
5,092
Portland, OR

Broken Hope

macrumors 65816
Jan 15, 2015
1,138
871
If the phone prefers WiFi Calling or not is up to the carrier, EE in the UK used to prefer WiFi Calling regardless of your mobile signal, since carrier update 32 it will now prefer cellular unless you have 2 bars or less than it will switch to WiFi Calling, since EE supports VoLTE over the entire UK calls that drop from WiFi Calling will seamlessly switch to 4G.
 
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iop

macrumors 6502
Apr 15, 2011
275
227
I used to have issues with my wireless router which caused it to drop internet connectivity for a few minutes every once in a while (the wireless network stayed on during those times). The phone stayed connected to the wifi network, and never switched to LTE automatically despite being effectively disconnected. It was, however, with iOS 10, so I don't know if this behaviour is the same nowadays.
 

Irishappletech

macrumors regular
Original poster
Aug 31, 2017
231
16
I’ve noticed a majority of times it connects to WiFi when in my house but sometimes it doesn’t and may only connect about 40 Mins later. Would this be down to not a strong enough WiFi connection and when it dosen eventually connect the WiFi strength is strong
 

Irishappletech

macrumors regular
Original poster
Aug 31, 2017
231
16
So I notice if I toggle WiFi calling on and off it will connect perhaps this is a bug in 11.3.1
 

Irishappletech

macrumors regular
Original poster
Aug 31, 2017
231
16
Basically I’ve noticed that my WiFi calling doesn’t my always connect when connected to WiFi only sometimes but when I toggle WiFi calling on and off it will display as WiFi call beside the carrier name

I have 5 signal bars of strength so i don’t think it will come on due to strength it must come on regardless
 

I7guy

macrumors Penryn
Nov 30, 2013
24,085
12,263
Gotta be in it to win it
Both both WiFi and VoLTE are forms of Voice over IP (VOIP) so you'd need to be able to transition from one network to another to make this seamless. Seamlessly transitioning from WiFi to CDMA\GSM just isn't possible since they're both totally different technologies.
Wifi to VoLTE is not WiFi to cdma though. I’ll have to try it out to see what happens.
 

JackieInCo

Suspended
Jul 18, 2013
5,178
1,598
Colorado
I believe that also depends on the carrier as well and perhaps coverage in the area.
I tried porting out one of my three lines from T-Mobile to AT&T. Knowing that AT&T is very bad in my neighborhood, I figured I could use WiFi calling. I was only able to make a WiFi call maybe 50% of the time and that was mostly at night when my AT&T signal seemed to improve. During the day, my AT&T signal was so poor that WiFi calling would rarely work and many times if the call did go through, it was filled with static.

I ended up porting my line back to T-Mobile because of this.
 
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