I bought my phone through some guy on Craigslist who was switching to Apple and needed money for the switch. I received phone and charger. He mentioned under his number he had a year warranty with Best Buy where he bought the phone; but I'm not sure if they'll honor me, so we'll go with my having no warranty. Everything has always worked beautifully, no issues. The other day I noticed when plugging in to charge, it wasn't charging. Tried moving it around and finally it charged. Then I noticed once it's plugged in, the screen is frozen and I cannot even swipe to take screen lock off. I have never dropped the phone, nor been rough with the charging port. Only a few times have I unplugged it before it was fully charged. I do use it while it's charging if that makes a difference. Thanks in advance.