501
NYPD faces backlash as it prepares to encrypt radio communications | New York | The Guardian
(www.theguardian.com)
This is a most excellent place for technology news and articles.
I would expect it to be nearly all devices. America was in the process of shutting down the old technologies and I believe has in most cases.
https://www.fcc.gov/consumers/guides/plan-ahead-phase-out-3g-cellular-networks-and-service