Wrong Apple ID
While updating my apps, my iPhone asked for the password for an Apple ID that I never set up before! How do I update using the correct one I have? I tried logging off then try logging in again, no avail!
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Did you get this phone used from another person? If so, there is an app (or apps) that were were purchased by that person still on the phone. Delete it and download it with your ID.
Ideally:
What to do before selling or giving away your iPhone, iPad, or iPod touch [or if you received one that had not been erased] - "Use these steps to remove your personal information from a device, even if you don't have it anymore." - https://support.apple.com/HT201351
