My smartphones have always weirded out on me and I don't know why. The latest - My IPhone 5 was about 8 months old and started glitching. While texting and emailing, the cursor will jump around, highlight, and erase. My apps will open and close, the touch goes crazy and rolls up and down and basically acts like there is a ghost playing with my IPhone trying to severely irritate me. Of course there has only been a few people that see this and never Verizon employees that think I'm losing it and trying to get one over on them. 2 weeks ago Verizon sent me another phone (refurbished) and its doing it again and it seems even worse. Could it be the Sim card? Has anyone experienced this?????