Why can't access my iCloud to my iPhone?

What happens when you try? Error message(s)? More information would help. Are you signed into Settings/Your Name/iCloud?

Do you have access to another WiFi network where you can try? That has worked for several people.

Try a restart.

Restart your iPhone, iPad, or iPod touch

Try a forced restart.

Reset Device

Sign into iCloud using the same Apple ID on another Apple device/computer. You should then be able to sign in.

iCloud: The maximum number of free accounts have been activated