Action on Hearing Loss (which is the 'trendy' name now favoured by the Royal National Institute for Deaf People, RNID) might be able to offer you advice if you contact them:
https://www.actiononhearingloss.org.uk/help-items/contact-us.aspx
Windows 10 has speech recognition software built into it, which has a 'learning' function:
https://support.microsoft.com/en-us/help/17208/windows-10-use-speech-recognition
(It's present in earlier versions of Windows too although it might not be as advanced. It's under Start > All Programs > Accessories > Ease of Access)
It should be possible to get it to work with a phone but your phone would need a headphone socket, which could then be connected to the 'line in' socket on a computer. However I'm fumbling in the dark here a bit, because it's not something I've ever tried myself. (Perhaps Action on Hearing Loss could put you in touch with someone with experience in this area?)