phone advice

I'm hoping someone else here has experience of this and maybe has some advice. I've been having persistent problems calling one particular mobile phone: rather than ringing, my call goes straight to voicemail, even when the two phones are in the same room. I've just had the problem with calls...

Looking to upgrade from my iPhone Xs Max and its unresponsive screen to something with a high touch sampling rate. I was thinking of going with the Note 20 Ultra but being based in the UK it seems I would be forced to get the Exynos version rather than the snapdragon. I wouldnt be too bothered...

So I'm looking to get a new phone for Christmas. I have a couple in mind, but I have no idea what phones are good and so on. So I'll list a few here. My budget is 150-230€. Xiaomi Redmi Note 8 Pro - This ones a bit expensive but seems like a really good phone...