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Hello Sergiiiito,

Thanks for choosing the Apple Support Communities. We understand you cannot access iCloud Mail on your iPhone. We have a few steps that can help you set this up and get things running. Check that out below.

Set up iCloud Mail on all your devices - Apple Support

"Set up iCloud Mail on your iPhone, iPad, or iPod touch

1. On your iPhone, iPad, or iPod touch, go to Settings > [your name] > iCloud.
2. If you want to send and receive iCloud Mail on your device, do one of the following:

• iOS 16, iPadOS 16, or later: Tap Mail, then turn on Use on this [device].
  • 
  • iOS 15, iPadOS 15, or earlier: Turn on iCloud Mail (or Mail).

3. If you want to keep Mail settings up to date across your devices, turn on iCloud Drive. The following settings stay up to date:

• The order of your mailboxes (for all iOS and iPadOS devices)
• Email address suggestions (for all iOS, iPadOS, and macOS devices)
• VIPs (for all iOS, iPadOS, and macOS devices)

4. To view your iCloud Mail, open the Mail app. Tap a mailbox or folder in the iCloud section.

For more information on how to use Mail on your iPhone, iPad, or iPod touch, see any of the following:

• iPhone User Guide: Send email in Mail on iPhone and Organize email in mailboxes on iPhone
• iPad User Guide: Send email in Mail on iPad and Organize email in mailboxes on iPad
• iPod touch User Guide (iOS 15 or earlier): Send email in Mail on iPod touch and Organize email in mailboxes on iPod touch"

If that doesn't help, please let us know exactly what you are seeing, and we will do everything we can to help. However, do not include any personal information, as this is a public forum.

Thank you!