Dear all, I am writing to seek help from the community and hope some of you may be able to give me some assistance. I have an iPhone 6 and since I upgraded to iOS 9.2 back on December 10, 2015, I have encountered problem signing in to my iTunes account on my updated iPhone6. Everything works fine initially and I was able to update the apps and install new apps on my iPhone6. However, in little less than 24 hours, I keep getting: "Your Apple ID or password is incorrect" when i try to sign in to my iTunes account again. The same Apple ID and password works fine on my iPad (also updated to iOS 9.2). I have never encountered any problem with my Apple ID and password on my iPhone6 prior to upgrading to iOS 9.2. I have also tested my Apple ID and password on my iPhone5 running iOS 9.2 and there is no problem. As the Apple Care+ for my iPhone6 is still valid, I contacted Apple for help. After numerous calls (I lost count) and return calls from Apple including having to reset my iPhone6 at least 4 times together with the Apple Consultant over the phone. It works for a couple of days (the most) and then back to the same problem: "Your Apple ID or password is incorrect." In the last reset with the Apple Consultant, I was asked to install an app on my iPhone6 to collect and send diagnostic data to Apple for troubleshooting. Since then, still no resolution though the Apple Consultant did write back to update me that Apple is still looking into the problem. Till today (1 Feb 2016), 53 days (and counting) since I first contacted Apple on this problem, the problem still persists. I was informed the problem has been escalated to the US team but still no news and neither did Apple offer a replacement phone even though I still have a valid Apple Care+ for my iPhone6. Has anyone encountered a similar problem before? If so, appreciate if you can share with me how and what steps did you take to resolve the problem. Thank you!