The thing is ... "full internet" has nothing to do with "full OS". Assuming apps get ported to the device (which is a valid qualifier even if it's a full "non-neutered" Linux install), anything that has a full IP stack, and isn't heavily proxied/firewalled/filtered by the provider, is a "full internet" device. Even Symbian, WinCE/WinMo, and Android.

What marketing-droids typically mean by "full internet" is the device has a web browser that's not a watered down "Mobile only" WAP browser ... support for pages and web applications implemented with java, javascript / ajax, and/or flash. That's really more "full web experience" than "full internet" ... but try teaching a marketing-droid distinctions like that ;-)