My contract for my iPhone ends in November and I'm considering canceling my plan. I only have 500 minutes and no texts and am considering using that money toward a larger data plan (maybe 5gb, currently have 3gb data). I will then port my number over to Google Voice. Has anyone tried to do this? If there are threads regarding this issue, I didn't have time to search through them. Edit: I probably wasn't clear enough, but I'm looking to get a tablet data only plan and use it in my phone. AT&T does not prohibit this, though AT&T does not approve of the other way around (iPhone/smartphone SIM in tablet).