I am using iPhone 6S for last 1 year. It was running properly but from last 1 week it is showing some verification error. I have verified all these properly it is showing iTunes verification failed. I am looking for the proper solution. Is there anyone who has faced this?

go to Settings > iCloud. click for you. create a check code from another Apple gadget which uses a similar Apple ID, by heading off to (the other Apple gadget and snap) Settings > iCloud > Password and Security > Generate confirmation code. enter the check code in the gadget with the blunder.