Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4UOS callsign genealogy
Currently held by PHILLIPS III, WILLIAM L
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K4UOS's current licensee, walking backwards.
- PHILLIPS III, WILLIAM LTNgranted 2013-08-13cancelled 2016-04-05
Successor callsigns
Callsigns held now by people who previously held K4UOS.
No current licensee on record previously held this callsign.