"But wait till you hear what the phone operator has to say."

It is world's 15th largest mobile phone operator with over 150 million subscribers.

Traditional phone operators have long been required by federal law to provide those services.

The following tables contain the complete list of mobile phone operators.

Some mobile phone operators have been given more than one operator code.

So far, the service is providing a small but growing source of revenue for overseas phone operators.

"A lot of time I have to get past these 20-year-old phone operators who only know what's in front of them."

A deal with the mobile phone operators, however, is still some way off.

I guess I could use a phone operator but that would cost me money.

Until a few years ago, he said, phone operators accepted more generic models.