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I had WiFi calling on my Experia 5 but after the latest system update crashed my phone I have lost WiFi calling due to doing a factory reset.
Any ideas how to re-activate this feature. Thanks in advance for any advice given.
It's usually granted by your service provider, for example, in the UK, you need to have a phone running o2's software, and bought from them to gain access to it.
Maybe remove the sim card, and try again, or contact your provider.
Ok basically a factory reset will bring the option as long as you have a WiFi call capable SIM card inside.
If not still there is a rare chance...
1 Remove the SIM, let the device restart completely and wait for a couple of minutes before you unlock the phone.
2 insert a SIM card from a different network
Let it restart and optimize for the new SIM.
3 Now repeat step 1
4 insert the SIM card you want to use , and then the phone will restart and bring the WiFi calls back.