David tethers his computer through his mobile device, but he's wondering if it's secure. Leo says it's probably more secure because cell phones are encrypted now. Using the Wi-Fi through his phone is a different matter, if he's at a public hotspot. At that point, his traffic is out in the clear and easily grabbed. If he's going to use a hotspot, Leo advises using the Tiny Hardware Firewall and a VPN. The Tiny Hardware Firewall is like a router that then connects to his phone. It's really good, but it can slow things down a bit.