Way, way back in the day, back around the time PSE&G put in their 900 system, there was multi-site 900 MHz Motorola trunked system that was exclusively for NJ Bell (Verizon) that went in around 1993. The only site I was sure about was at the Boy Scout Camp in Alpine. It wasn't "dispatch" in the sense most scanner people thought of it. No one really camped out on the talkgroups, but rather used MRTI (mobile radio telephone interconnect) to contact their respective offices by phone patch. They would press a button on the side of their MTX900 (MT1000 style) handheld or front of their Spectra and get a dialtone, then key in the number of who they wanted to speak with the DTMF pad. But cellphones were still not necessarily mainstream at the time (I had a Marty Cooper brickphone back then). Before that, they used butt sets and grabbed any dialtone they could from a pedestal or punchdown block somewhere.
I believe those 900 MHz licenses were sold to Nextel (although they may not have used them) and are now part of the massive Pacific Datavision Holding Co. - PDV - license cache.
To my knowledge, NYNEX outside plant guys never used "dispatch" radios. There would always be a couple of portables for site work, but never anything that was extensively used. Mobile guys used cellular. And, "other mobile systems" actually still rode IMTS into the ground (and then some, by a converted VHF repeater). Anyone who would have used such system retired out or left a very long time ago, and those Part 22 frequencies (152/157 MHz) were auctioned off.
Most of the RBOCs now use mobile data and computers. Their vehicles are decked out with monitoring like James Bond cars and managers have all kinds of performance and productivity metrics to keep them busy. I wouldn't be surprised if there are sensors to detect if the cones haven't been taken off the truck once the vehicle is parked.
Those onsey-twosey licenses are like Tech792 says, for facility admin and maintenance.
