I phone 7
i phone 7 in update iso13.1.2in call voice not working
iPhone 7
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Update to iOS 13.4.1.
With the limited information that you have provided, I had to guess the problems faced by you. Some of it can be understood by reading below
Not available in many regions and countries --> Use Voice Control on your iPhone, iPad, or iPod touch - Apple ...
VoiceMail is a carrier Specific feature, ensure they have this enabled for you --> Set up Visual Voicemail on your iPhone - Apple Support
If you are unable make a call or receive; If you can't make or receive calls on your iPhone - Apple Support