Thank you for your reply. I have tried all the options given in that link. I could not sync the new phone to my system. But the same system was used to back up my previous phone. No other account has been used in this phone. U cloud in my phone sometes asks me to sign in and when i sign in it shows wrong password even when it is the right password. But when i entered icloud from my system, my password was accepted. Is there any connection between these problems?
ALso recently before trying to sync, i unknowingly restored my phone to the back up from my previous phone rather than registering this as a new phone.