Wi-fi calling only working intermitently on Samsung Galaxy S24FE

I recently moved to ID Mobile from O2. I have a new Samsung Galaxy 24FE which worked perfectly on O2 with Wi-Fi calling - always offering Wi-Fi calling whenever it was connected to Wi-Fi.

When I moved to ID mobile (with a physical SIM) I ensured Wi-Fi calling was enabled on the handset - the only option is “Make and receive calls over a Wi-Fi connection whenever available”. However it only works intermitently and will drop in and out of the Wi-Fi calling seemingly at random. This happens mostly at home where I’m on Virgin Media, but also at my Mum’s house on Sky broadband and in pubs / restaurants. At work it seems to hold Wi-Fi calling much better.

I can force it onto Wi-Fi calling by putting it into Airplane mode, but that’s not ideal. After searching on the community I have today installed an eSim to replace the physical SIM (which separtely solved the problem I had with the wrong number showing in RCS chats).

My number has always correctly shown in SIM Manager, but the eSim has made no difference to holding Wi-Fi calling - it did for the first minute then lost it.

It’s so frustarting, becasue I never had to theink about it with O2 - any suggestions to fix this would be appreciated.