How do I make an “genius bar” reservation?

Hi silky4583,

Welcome to the Apple Community.

Wondering which iPhone model you have, which iOS is installed on it,

and

whether you received an error message on trying to update, ... if so, that may help point to the solution.

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Re: "Unable to make or receive phone calls or access cellular data!"

You might want to browse this article from Apple Support:

Manually update your carrier settings on your iPhone or iPad

https://support.apple.com/en-us/HT201270

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Re: ios 15.2 and now 15.3 will not update.

Apple Support's online article

"If your iPhone, iPad or iPod touch won’t update"

Says:

:You might be unable to update your iPhone, iPad, or iPod touch wirelessly—or over the air—for one of these reasons.

• • • Not enough available storage space on your device
    • Downloading the update takes a long time
    • Unable to reach the update server
    • The update doesn't complete"

See the complete article: https://support.apple.com/en-us/HT201435

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Re: who can help me use iTunes to download updates ?

Apple support have an article online (link below) that may help you update:

NB: If you do not have a computer to use, you may be able to borrow one from a trusted friend, or family member.

(Or ...you would likely be able to access a computer at an Apple store.)

NB: For macOS Mojave or earlier: or a P.C. update with iTunes>

NB: For macOS Catalina or later, follow the link in the article to update using the Finder

Article: "Update your iPhone, iPad, or iPod touch with iTunes"

Learn how to update your iPhone, iPad, or iPod touch to the latest version of iOS or iPadOS using your computer.

Complete article: https://support.apple.com/en-us/HT212186

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Re: the closest apple store is an hour and a half away

There is a "Get Support" link to Apple (online chat, phone, eMail etc.) at top right on this discussion page.

Or

To Contact Apple for support and service

See a list of Apple phone numbers around the world.

https://support.apple.com/en-us/HT201232

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Re: How do I make an “genius bar” reservation?

If you need to visit an Apple Store:

Check out the Genius Bar webpage online at https://www.apple.com/retail/geniusbar/

or

From iOS device using the app to make a online Genius Bar appointment is easy: 

https://itunes.apple.com/us/app/apple-support/id1130498044?mt=8

All the best :-)