I'm a dumb phone user of T-Mobile's pre-paid which is only for talk and text. My phone is ancient and I'm planning on buying the 16gb Nexus4 in a few days and was wondering if I'll be able to use my existing pre-paid plan(if I cut the sim card down to a micro sim) and yet still be able to use the phone's wi-fi while at home to access the internet and make calls like with skype or google voice. Will it let me use it's wi-fi even though my phone plan does not support data?