Hi Heather,
Looks like maratsade gave you some great advice! Personally, if I have to do something data-intensive like downloading a movie, I will click the mobile data icon on my phone and turn it off. Since I'm on wi-fi I will still get text messages. The same can be done through airplane mode. I do this in the event my wi-fi signal drops out when I'm not looking ever since the time my better half fell asleep with a TV show on his phone and the wi-fi on his phone disconnected... overage charges on Verizon is not something I'd wish on anyone!
I can definitely offer tips for saving data if you have an Android phone, but Apple products might take a bit of research.
Thanks,
Amanda
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