Callers previously needed operator assistance even to make domestic long-distance calls.

He called operator assistance, and a minute later was being put through to the surgery group the doctor belonged to.

Until the dial tone telephone came into widespread use in the 1950s, one could not place calls without operator assistance.

These were an early form of regional tollfree number which required operator assistance.

Calls from East Berlin were only possible with operator assistance.

This service is predominantly used for larger meetings and typically includes operator assistance.

No major delays were reported for those calling without operator assistance.

He tried once with, operator assistance, and she told him there must be lines down.

In some countries, dialling 0 places a call for operator assistance.

These switches allowed customers to connect their own calls without operator assistance.