If your T Coil works for other things then it’s obviously the phone might not have the option for T Coil.
Thanks, Zebras. Where are you located? I googled the same question and got the same response that you posted. Looking closer, however, I see it was posted from the UK.
Here in the US the Federal Communications Commission requires all landline phones to be be hearing aid compatible which, among other things, means it should work with a telecoil. My phone says it is HAC.
I’ve just googled what HAC means.
HAC doesn’t mean it has telecoil, it means there won’t be any interference with the hearing aid when using it.
Sometimes tho, it means there is also telecoil as well but not always.