the maximum number of free accounts have been activated on this phone ?

Any one device can create only three iCloud accounts: this is tied to the hardware, not the user account, and there is no way round this.

You will have to create an iCloud account on another iOS device or Mac, then you can sign into it on your iPhone.

HAllow I'm having the same prob.. I'v tried several times to login using other apple id that I didn't register it in this iphone but it gives me the same reply that "the max number of free accounts have been reached" help please.