Not taking my cell phone
Honestly, my husband works out of the country (WAY out...) and we use the new facebook messenger to make phone calls. It sounds like he's sitting right beside me... never had a problem with it. If you have an internet connection and a mic on your tablet/device, you should be able to use it for free. It's just audio (not video like facetime or Skype can be...) but because of where he is, we find FB messenger to actually be a clearer call. I'll be heading to Tijuana in 2 weeks (oh my goodness), and I think we'll just use that.