I have a smart phone with StraightTalk service and do not have service at my house (I live in a valley and get absolutely no service and I previously had a iPhone with Verizon). I am an iOS enthusiast I'll admit but i got this phone to get used to Android. I don't quite understand it all yet but i love the fact that it does way more than my old iphone 4s. I just need to know a good app to make calls via my Wi-Fi network that i can use my existing cell number. Thanks