SMS sent from BT landline not received unless on 3G...

[dougwzz98]

Hi,

I have a Samsung S20 Ultra. It receives SMS messages just fine from everwhere EXCEPT my BT landline. I've found by some testing that the BT landline SMS only comes through if I switch off WiFi and drop down to a 3G connection.

I suspect some issue with WiFi calling and/or 4G calling. What I don't understand is that other SMS come through just fine with WiFi and WiFi calling switched on, it's *only* SMS from the BT landline that seems to have a problem. 

Would welcome any ideas on how to fix this, short of turning off WiFi calling (like I say other SMS comes through just fine with it on!).

TIA. 

[MI5]

@dougwzz98 

O2's support of any sms over wifi is still very new so likely a bug that either hasn't been identified or ironed out yet.

Best to report it to O2.

If you message O2 on Facebook (https://o2uk.co/O2CFB) , Twitter (https://o2uk.co/O2CTW) or Instagram (https://o2uk.co/O2CIG) , they should be able to help you with this.

[dougwzz98]

Thanks, I'll report it to O2. 

[dougwzz98]

So I got in touch with O2 but (as I kind of expected) the advice was somewhat generic i.e. do a network reset, how to switch from 4G to 3G, try the SIM in another phone (incidentally the text from my BT landline is received just fine on another phone with my SIM in it because it's an older phone and doesn't support 5G, WiFi calling etc.).

I have done a few more tests and found that even with WiFi/4G calling disabled the BT landline texts still seem to fail. The only way to guarantee delivery is to have the mobile on 3G with WiFi switched off - the texts come through every single time with that setup.

I'd really like to report this to some technical 'level 2' support in O2, because I'm pretty sure that (unless I leave my phone permanently on 3G with no WiFi) there is nothing that O2 can advise me to do from my side that will fix this issue. Is there any way I can sidestep the 'usual' O2 frontline support and report this to a technical specialist?

TIA.