can not turn on icloud

On your phone, I would go to Settings > Name > iCloud. Then, turn on the apps you want to sync to iCloud. But, as FoxFifth says, yo may want to reply with more information.

iCloud includes a variety of services. It isn't clear to me what you mean by "can not turn on icloud." You may want to reply with more information.

That sounds like a good possibility -- I was having a hard time coming up with even a reasonable guess.

It helps to be 🤪.