Why does my iPhone 12 Pro Max keep losing service?

"Why does my iPhone 12 Pro Max keep losing service?: [...]I tried to reset the whole phone, but the status bar got stuck at the end and I had to wait for the battery to die. It came back on in the same status I started. I even tried deleting my work stuff off the phone. I'm at a loss. I live in a rural area, so there is no chance of my stopping by an apple store."

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Troubleshooting Calls:

A. Start Here: If you can't Make or Receive Calls on your iPhone - Apple Support

B. "No Service":

Is "No Service" shown on the top-left corner of your screen? If so, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support

C. Install a Cellular Update:

It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

D. Use my User Tips:

• Computer:  Update your iPhone Using a Computer - User Tip
• Cellular: Use an iPhone 12 or later, that is using 5G, in order to update over Cellular - User Tip
• IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

Hello~ Have you force restarted you iPhone?

Force restart iPhone - Apple Support

Your tag line says yo are using an iPhone 12 Pro Max? What is your battery health? Go to Settings > Battery then tap Battery Health & Charging. If the % is 80 or below you need a new battery.

Genius Bar Reservation and Apple Support Options - Apple

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~Katana-San~