ring around (sb/sth)
UK also ring round (sb/sth)— phrasal verb with ring uk/rɪŋ/usverb rang, rung
[ 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.