You can forget about it, everyone who has wiFi calling will tell you the outbound volume is extremely low even you are only 1 inch away from your 50Mbps High speed internet, this happens on everyphone, and it has been reported since Jan, 2010, yes, year 2010, and T-Mobile never cared about it, I just smashed my phone to the wall, as this T-Mobile/Samsung Vibrant often crash and does not respond UNLESS you change the battery.
T-Mobile has horrible call quality and coverage, and now the CEO ruined the company by having horrible customer service.
I am leaving T-Mobile NOW!
I have a similar problem. The called party reports that my volume drops very low for a while before getting back to normal. This happens frequently during the same call. The wi-fi signal is excellent at the phone and it happens even when the phone is right near the router.
On the calling end, the voice from the called-party sometimes gets garbled for a few seconds. This happens even when the called party is on a good land-line.
T-mobile support - Please respond to this issue. I'd like to hear your suggestions to improve the wi-fi calling experience and also what you are doing on your end to improve this.
On the incoming voice, I don't find any difference between a wi-fi call and a regular call. But the outbound has to be ridiculously low because of the level of complaints that I get that people can't hear me. Over and over again, I am asked to repeat myself and then people will try to say back to me what they think that I may have said and it will be something completely different.
To me this seems like a completely unusable service, if it only works in one direction. Can somebody from t_mobile please comment as to if t-mobile acknowledges this? ...is working on it?
Does anybody have any ideas on this? Are there any tricks? I have seen this topic mentioned in numerous threads, but I can't tell if what we are experiencing is everybody's experience or if this is a random issue? For me, it is to the point of making wi-fi calling an unusable feature as it presently exists. I can sit here and scream into the phone, while talking to my girlfriend who is sitting in a quiet, private office and she still won't be able to make out everything that I am saying.
Nobody had anything to contribute on this issue here, so I went through phone support and they sent it to some group who looks at the symptoms and determines if it is something to walk through with the customer or they just send out a replacement phone. In my case, they read the issue and determined it to be a bad unit and they are sending me a new (refurbished?) phone. I actually was hoping that there was a way to fix this, as the rest of my phone is fine, just that this wi-fi doesn't work. Also, I can't even think about going through a whole new build from teh ground up on a new phone, when I just speant three days doing it after a master reset for ICS.
I know that I have seen a couple of people comment before about this being some sort of well known problem at t-mobile, but the phone support made it sound unique and something worth sending a replacement unit. I direct mailed one of the T-Mo people on here, as well, but never heard back. Maybe this is a unit specific issue and whoever runs into it will probably have to get a replacement.