Why doesn't Wifi calling include SMS and MMS messages?

[adamtemp64 Level 65: Ultra-cool]

As o2 were late to wifi calling I would not expect to see it anytime soon (hope to be proven wrong)

[Martin-O2]

Hi guys, 

I've chased a response to this question this morning. I'll update this thread as soon as I have news. 

[Anonymous]

Hmm, totally not impressed with O2 over this.  O2 were last to the party with WiFiCalling then don't include SMS with this technology.  WiFiCalling seems to prioritise itself as the default, while I have a WiFi signal, even with a mobile signal, calls are routed over WiFi.  Since SMS doesn't work across this, I'm now not receiving text messages nor am I able to send them.  I use an iPhone SE so iMessage works but many of my contacts are Android users and I cannot send or reseive SMS from them, I cannot advise them all to use WhatsApp and some senders, namely delivery companies use SMS to advise me of deliveries, these messages won't get through to me.  So, turned off WiFiCalling then found I cannot go back to Tu as it now doesn't work with my account.  Come on O2, get this sorted!  Else after more than 12 years it's time for me to change to a better provider........

[MI5 Level 94: Supreme]

Wifi calling has absolutely no effect on text messages at all.
Whatever problem you had is nothing to do with that.
If you want to go back to Tu you need to de-register from wifi calling.

[dplumb]

You say that, but on Three and EE, you can send old school SMS text messages of the 160 character variety (that appear in green within the iPhone app) over wifi calling.

I have no cellular of any kind at home, I leave my phone in flight mode with wifi on, I have wifi calling enabled, see "EE WiFiCall" displayed, and can send and receive old school text messages quite happily.

Question is, why does this not currently work on O2.

[MI5 Level 94: Supreme]

Sorry, didn't realise you were in flight mode.

[Anonymous]

After extensive testing, I can state that SMS text messaging does NOT work via O2's WiFi Calling.  If I have no mobile signal at all, or indeed am in Flight Mode with WiFi enabled, I cannot send nor receive SMS messages.  I have noticed however, that if WiFiCalling is displayed and I still have minimal mobile signal, SMS does work, lose the mobile signal, lose SMS ability.  Not very good is it?

Have O2 responded why SMS is not enabled over WiFiCalling while it works with all other UK mobile providers?  When will O2 enable this feature?

[MI5 Level 94: Supreme]

We wouldn't know as we are only customers like yourself.
You'll have to ask customer service.

[Anonymous]

From the previous post by Martin-O2, Community Manager:

"I've chased a response to this question this morning. I'll update this thread as soon as I have news."

So I was essentially asking if he had news, even though I presume he is part of the "we" you refer too.  If I were to ask customer service, do you really think I'd get a straight, proper, truthful and knowledgable answer?  Really??

[MI5 Level 94: Supreme]

My point is that no one here works for o2 in any official capacity in relation to the community.
Asking o2 is the only way to get an answer to your question but if you want to chase Martin to see if he has any news from o2 you'd be best to tag him so he sees your post @Martin-O2