Welcome to Vodafone Community
Hi there @PeterYetman - I appreciate that switching to airplane mode to ensure WiFi calling works isn't always the ideal solution. We'll take your comments onboard regarding a feature that could improve WiFi calling and feed this back internally. Thank you, stay safe 🌈
Move to Android? 😀
Some Androids let you select "prefer wifi calling" which would solve your problem.
If your phone is picking up a very weak signal, it should really stay on wifi calling though, but it thinks it's good enough for calls it seems.