My phone has reached maximum amount of free account that can be logged in on the device

See -> If you see a Could Not Create Apple ID or Could Not Set Up iCloud message

If you see a Could Not Create Apple ID or Could Not Set Up iCloud message - Apple Support

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What should you do?

• If you have another iPhone, iPad, iPod touch, or Mac, you can try setting up iCloud with your Apple ID on that device. Sign in with your Apple ID, then follow the onscreen steps to start using iCloud. 

• Or, if you already have an Apple ID set up with iCloud, sign in with that Apple ID instead. 

• If you still need to set up iCloud with this Apple ID, contact Apple Support for help.