Iphone SE (2020) battery drain

Hello Petitemarie23,

Thanks for clarifying the issue.

You may want to make sure that the issue is not related to software. You can do so by ensuring that your iPhone software is up-to-date. If not, make a backup of your iPhone and update the software. The update process can frequently address unexpected software behavior. Here's a guide to help: Update your iPhone, iPad, or iPod touch - Apple Support.

When turning off cellular data, are you doing so from Settings or the Control Center? Does the problem happen with both? You may want to test, as a means of further isolating the issue.

If the software is current and you're still experiencing the issue, you may want to reach out directly to Apple. They may be able to offer further steps and guidance about this issue. Contact Apple for support and service - Apple Support

Cheers!

Hello and welcome to Apple Support Communities, Petitemarie23,

If we understand your post correctly, your iPhone is not holding a charge as long as expected and you're seeing a no cellular coverage message. We’d like to help.

Follow the steps in this guide to check your battery usage information and improve battery life:

Batteries - Maximizing Performance - Apple

To help with the cellular service follow the steps in this article:

If you see No Service or Searching on your iPhone or iPad - Apple Support

Let us know if that resolves this issue for you.

Thanks for using the Apple Support Communities.

Hi Petitemarie23,

We appreciate you trying all of the troubleshooting and since the issue is still persisting, we'd advise to contact Apple Support: Apple Support

Let them know exactly what's happening and the troubleshooting steps you've done so far.

We wish you the best!