Registration is easy. Give the respective operators a call. Call 104 for a complete listing of country codes. For StarHub details, please contact them using details above. Public phones can be found in abundance across the island.
Phone cards are available at all post offices and from phonecard agents everywhere.
Although most coin-operated pay phones are for local calls only, there are some which accept coins of larger denominations and can be used for oversees calls. Most credit card phones are found at the airport or perhaps in major hotels. StarHub have been bringing out their own distinctive green public payphones to compete in this market also. Singapore has one of the highest mobile phone and pager ownership figures in the world. Day in, day out, on buses, in the MRT, it just, well, sounds like a melody.