ring around (sb/sth)
phrasal verb with ring verb uk/rɪŋ/ usrang | rung
( UK also ring round (sb/sth)) [ I or T ] COMMUNICATIONS
to call several people on the phone in order to find out information or organize something:
The first thing they did was to ring around all their competitors' stores undercover to find out their prices.
I always ring around to get the cheapest quote.