Fixed line
Numbers starting with 6691
2 Singapore fixed line numbers in this prefix appear on public websites.
About the 6691 prefix
This looks like a Singapore fixed-line number. Reports often mention company switchboards, delivery callbacks, property agents, or unsolicited sales calls.
6-prefix numbers are commonly used for Singapore fixed-line services. Numbers in this list are written locally as 6691 xxxx, internationally as +65 6691 xxxx, and as 8-digit 6691xxxx.
6691 numbers found on the web
+65 6691 1938
6691 1938 · 66911938 · Fixed line
Fall Prevention’ on 938LIVE’s Body & Soul - SPD on spd.org.sg
1 web mention
+65 6691 1994
6691 1994 · 66911994 · Fixed line
Car Hire in Banja Luka - Search for Rental Cars on KAYAK on kayak.sg
1 web mention