Area Codes in Singapore
no area codes

Phone numbers from Singapore
are preceded by the +65 country code if you call from outside the country (international)
+65 is part of +6 dedicated to the Telecom Zone "South Asia"

Landlines or fixed lines are preceded by 0
if you call from inside the country (national)

followed by
8 digit subscriber number

Singapore has an closed phonesystem
with the lenght of phonenumbers always beeing the same

Mobile Numbers
Mobil numbers in Singapore
+65 8 or +65 9
followed by the same are code as fixed lines
followed by mobile subscriber number

other Countries
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