I own mobile phone. When contract is ended can I change my provider. Will my phone be unlocked?

Yes, once your mobile phone contract ends, you can switch to a different provider. Whether your phone is unlocked or not depends on the policies of your current carrier; many carriers automatically unlock devices after the contract ends, but some may require you to request an unlock. It's best to check with your provider for their specific unlocking policy. If your phone is locked, you may need to follow their process to unlock it before switching.