Sounds like your co-worker is talking about a VPN service perhaps. If that is the case, he is correct. Think of a VPN as a "pipe within the pipe" of the internet. It keeps your information safer, and not as easy to tell what you are sending (trying to simplify here) You still need to have a WiFi Connection to use a VPN. So you still need campground wifi, or coffee shop wifi, or library wifi - some sort of internet connection. But with the VPN you are safer.
The VPN does slow things a bit as well - since everything that passes through your "private pipe" has to be encrypted.
There are Prepaid Hot Spots from Verizon, AT&T and others - just like prepaid phones. That might be an option for you? Use WiFi when you can - and if you can't - use your pre-paid device.
Hope that helps - Having Technology while your traveling is a blessing!