over the past week or two, i keep getting calls from numbers in my area code. when i answer, nothing is there and call disconnects after a sec seconds. calling the number back, it says number is not in service... i keep getting these, all hours of the day, one or two calls a day. it never leaves a vm. i called verizon and their records show no sort of calls by those numbers, and its a new number each time. ive ran a few virus scans, nothing found. all my apps are legit apps Any clue?