Hi Caeltiegirl,
welcome to the Apple (user-to-user) Community!
Re: Getting Phone to select options verbally
Am no expert in this area, yet your request surely deserves some response, if only to get a discussion underway so that others have more opportunity to contribute a solution.
Apple support have articles online that can be helpful in accessing IPhone's accessibility features.
The Mobility website describes the various features that may be useful.
See: Accessibility - Mobility - Apple
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Re: I have thought of pairing Siri with voice control however voice control is that overly reliable it doesn't seem to work.
Apple provide helpful videos that can introduce & show how to make use of accessibility features:
Eg: How to use Voice Control
https://www.youtube.com/watch?v=eg22JaZWAgs
How to make custom commands in Voice Control for iPhone, iPad, and iPod touch
https://www.iaccessibility.com/videos/apple-support/index.cgi/video?ID=328
Online (non-Apple) article : An overview: "Everything you can do in Voice Control"
https://www.imore.com/everything-you-can-do-voice-control-iphone-and-ipad
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More support / help: You may want to contact Apple's Accessibility Support Team:
How to contact Apple for accessibility support - Apple Support
or
Apple's Accessibility Support Website
(NB: You can "Get Support" from the link at the bottom of their website:)
Accessibility Support - Official Apple Support
Hope there's something helpful here.
All the best :-)