Hello suleiman212.
Thanks for reaching out to Apple Support Communities. We see that you cant sign into iCloud with your iPhone. iCloud is important and we will be glad to assist.
Please see the information below which can help:
"If you're not able to sign in using cellular data only
Make sure that your iPhone, iPad, or PC has a strong Internet connection and that you've turned on cellular data on your iPhone or iPad by going to Settings > Cellular or Mobile Data. If this setting is off, you might not be able to access your Apple ID and iCloud when not connected to a Wi-Fi network. "
If you can't connect or sign in to iCloud
Cheers.