Keypad and DTMF tones not working during a call

[taffw]

Hi,

I have a new Samsung Galaxy S10 plus and it seems to be upto date with all software. basically during a call the keypad and DTMF tones don't work, so when i'm through to say a call centre when it says please enter option 1 or 2 etc, it doesn't register at all so very frustrating. I did a chat with Samsung and tried all the things he suggested but nothing. He then said well you will have to contact our Samsung Web developers !! which is frankly quite dissappointing. It still isn't fixed and means I can't do thing like contact my bank or enter payment details during a call. I've come over from Apple and so far not impressed at all. Does anybody have the same issues or any suggestions. i'm on Vodafone. This to me is basic called but it doesn't seem to work or is my phone faulty?

[Caramba2]

This is the only solution that worked. However many networks don't allow you toggle VoLTE calls off/on, so you need to change your network mode, go to settings>mobile networks>network modes and from Network Mode from "5G/LTE/3G/2G (auto connect)"  to "3G/2G (auto connect)". After you have done your call that require DTMF tone, then re-select back to 5G/LTE/3G/2G. I spent 2 hours reading all solution, even installing a new keypad and the issue was this with my bank.