My email account was hacked the other day. I learned about the "view recent sign in" feature on Yahoo where it shows you a history going back a day or so of all of your sign-in attempts and the location (just the city/country) and IP address, and whether accessed via PC or mobile. The PC's were easy to pick out.....home and work. The mobile, I saw two different ones the day of the hacking, one in Massachusetts in the morning hours, and then one in New York in the afternoon. I am in New York, so I assumed the NY was me and the MA was a hacker. Today, I view the recent sign ins and see a different IP address for a mobile network from Ohio. I thought that I had been hacked again. Then I tested something out, logged on with my phone, and then checked and it looked like the Ohio IP address actually WAS my phone. This may be a naive question, but could my phone's IP address be constantly changing over that wide of an area, where maybe it's assigned one temporarily in one area, and then switches? Not a tech geek here, so dumb this down for me please. Thanks.