Most network or telephone cable is #24 or smaller gauge. It'll work, but I find that it gets a bit touchy as the breadboard gets a bit of wear on it. I managed to luck into a "deinstallation" at the Naval base where I was stationed on Okinawa. They were throwing out a couple of hundred feet of this cable. It made it to the dumpster but I managed to snag it before the locals got it to recycle for the copper. It was 30 pair cable, each pair individually shielded with a drain wire. All wire was tinned, #22, solid copper with single-color insulation. When you went through all the various pairs, I ended up with all ten EIA colors. Insulated wires could be pulled for breadboarding; drain wires for short breadboard jumpers; shields pulled in long strips for making custom 300-amp jumper cables. Wonderful stuff. Needless to say, I'll never run out of it.
Oh. Uh, the question. Yeah. I like to stick with #22.
Dean