I'm getting a notification from my affil network a certain offer is for 3g traffic only.
Fine, but my targeting options on my platform are either to target wifi connections or cellular connections. Am I just outta luck on trying to get as granular as connection speed?
I'm pretty sure your AM just means "cellular connections".
Virtually all the carrier traffic you get, from most countries, will be 3G or 4G so it should be fine. And yeah, by 3G they probably just mean non-WiFi.