on 17-09-2017 08:44
Have you tried to enable airplane mode then turn wifi on iphone see if that connects
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on 17-09-2017 08:48
Try with all security and firewall turned off in router settings as a temporary measure to see if it connects then.
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17-09-2017 15:20 - edited 17-09-2017 15:21
This seems to have done the trick.. I enabled airplane mode. Turned the wifi back on, then within seconds, the wifi calling icon has appeared. I disabled airplane mode, and the wifi calling icon has remained on.
Thanks for all of your help and suggestions.