Originally Posted by
Carnage Matey!
Usually ATC, who in the UK will say "Radar Control/Information/Advisory Service" when they have identified you and in Brazil say "Radar Surveillance".
ICAO phrase is "radar contact" and also "(radar) identified" but this is omitted most of the time these days.
My theoretical concern was when you lost comm and were about to leave radar coverage, who makes you aware of which rules applies?