IP telephony
Numbers starting with 3991
2 Singapore ip telephony numbers in this prefix appear on public websites.
About the 3991 prefix
This number uses Singapore's 3-prefix IP telephony range. Community comments often help clarify whether it belongs to a business line, VoIP service, or a suspicious caller.
3-prefix numbers are typically used for IP telephony services in Singapore. Numbers in this list are written locally as 3991 xxxx, internationally as +65 3991 xxxx, and as 8-digit 3991xxxx.
3991 numbers found on the web
+65 3991 0678
3991 0678 · 39910678 · IP telephony
Hotel (Vietnam) - Singapore Business Guide on sbg.sg
1 web mention
+65 3991 8888
3991 8888 · 39918888 · IP telephony
Xinwenyuan Hotel S$Â 41. Dalian Hotel Deals & Reviews - KAYAK on kayak.sg
1 web mention