A company named Kallback has been advertising in The Royal Gazette , promising subscribers "international phone calls for less''.

The company's name alone suggests it is operating a callback system, such as the one offered by Global Access Bermuda before the Supreme Court ruled it had to seek a telecommunications licence. A decision of the Telecommunications Commission is pending.

Mr. John Instone, spokesman for Cable & Wireless, said he was unaware of Kallback having customers in Bermuda and no action against the company was planned "at this stage''.

"We're not familiar with this particular company.'' Unlike Global Access, Kallback had no physical presence in Bermuda, he noted.

Kallback, which charges a $50 activation fee and a $10 monthly fee, promises long distance savings of 50 percent or more. To call the United States from Bermuda, it quotes rates of 53 cents to 90 cents per minute, depending on the time of day. Telco charges 90 cents to $1.25 per minute.

A Kallback spokesman said rates were also available between Bermuda and the United Kingdom, Canada, and most other places in the world.

Mr. Instone said he believed most long distance users who might consider a callback service were waiting to learn the outcome of the GAB application.

More than 1,000 customers signed up with GAB after it launched its service last spring. At the end of May, Cable & Wireless blocked the company's calls, and Puisne Judge the Hon. Mr. Justice Ground later ruled that GAB required a Bermuda licence.