I have a new Macbook Pro and use my Android to tether my unlimited data to my MBP, though I am thinking of getting the new iPhone, and by doing so, I will lose the ability to tether it. I have the firewall and stealth mode set up on the MBP. 1. What if anything, can someone realistically do to the packets of data I send/download on open WiFi? 2. Can someone use open WiFi to get into my MBP? Thanks in advance!