I am going to Europe for a month and I saw a good 500MB data only package for the sim card there that's valid for 30 days. I am currently with Sprint and they give me unlimited data so that I never thought of looking up my data usage. Now that I have only 500MB, I want to see if you could provide me some insights of my usage in Europe. Basically, I just need the data on my iphone to use for google map's public transit only. I find that one is very useful and I am heavily relying on it when I travel. Do you think 500MB data for almost a month (25 days) is enough? I will make sure to turn everything else off except google maps. Thank you.