HM idk ever since I got my 925 almost a year ago I've had to turn wifi off otherwise the SMS would instantly fail
I think it's a great question. I've been on AT&T with WP7 and WP8 and 8.1 and I always thought it was stupid that you can't send sms/mms through wifi. I didn't get cellular coverage in my house until I purchased a Microcell. In case people haven't noticed, AT&T doesn't have the best coverage.Or even SMS through cellular while wifi is on. It would be nice to not have to turn off wifi to send a text.
Why would you not be able to use wifi for this anyway?
There was a previous post on the problem previously on WPCentral - http://forums.windowscentral.com/windows-phone-8/206127-cant-send-mms-messages-while-wifi.htmlHey Meagey
I have never heard this before on WPC. I'm stumped, so I can only chime in with everyone else and say this is definitely NOT normal. If nobody else here at WPC can help, you really need to visit a carrier store and show this to them. It's definitely unacceptable and they will sort that out for you. If you can, let us know what the problem was.
There was a previous post on the problem previously on WPCentral - http://forums.windowscentral.com/windows-phone-8/206127-cant-send-mms-messages-while-wifi.html