Watching SG1 s10e7, and a jaffa uses one of the team's radios to talk with Daniel Jackson and then to deliver orders to his subordinate, and it made me wonder why the goa'uld never gave the jaffa handheld communicators. It seems like all messages are delivered by word of mouth except for ship to ship communication, and the communication balls which are apparently only used by the goa'uld themselves. Given how useful it would be for coordinating troops I'm surprised they don't have them. I wonder why the showrunners never thought to give them something like a goa'uld radio.
Iirc don't goa'uld have a tendency of stealing technology. So I would assume they just never found technology that did that. I don't even think they had scientists or people who learn to make new technology for the Jaffa. So I would assume it just never was found.
Plus earths technology is way different because of our smarts. Jaffa never got that ability as they are slaves to the goa'uld who think there ways are the only ways.