If you are looking for a list of the different area codes used in Trinidad and Tobago or to check if a number is a cellphone on Digicel or Bmobile (TSTT) or Flow check this link:
Our international country prefix is '868' so the local area code is the 3 digits after this in the first column.
The TSTT residential phone book (the only one in the country as far as I know) has no mention of Digicel area codes in it.. typical TSTT behaviour.
How do I know if a number is Digicel or TSTT(Bmobile)
Check if a number is Bmobile(TSTT) or Digicel or Flow(Columbus Communications)
What area code is this number
Area code for different areas