I'm going to be doing some traveling and want to be able to occasionally check my credit card or bank records on WIFI. So, I signed up for a free VPN through Tunnel Bear and they gave me 500mbs. First, is it safe to do this via the free VPN? I read that's the way to do it because Wifi alone is not safe for this. Second, I know 500mb is not much but I don't know what that means. I only intend to do a little bit of checking; not going to download stuff. How long will 500mb last or do I need to upgrade before I go? Thanks for any help.