Delay on WiFi calling

[DanielN_1870135]

Only moved to SMARTY from Three a month ago.  

There is a delay between when I speak and the other person hears it. It makes it impossible to have conversations. There is nothing wrong with my broadband. It was never like this with three but I can’t imagine what is causing it. 

[Chalkychap]

I also sometimes get a delay when using SMARTY's WiFi Calling service @DanielN_1870135. 
I've found that by adjusting my position slightly, or redialling, I usually improve the WiFi Calling call quality.