While the number was ringing, he turned to Stone.

The number rang four times and then his answering service picked up.

The number rang for a long time because it was already the middle of the evening six thousand miles to the east.

He made up a speech while the first number was ringing.

Why didn't she ring such-and-such a number to find out?

The number rang four times and then somebody picked up.

The number rang twice, then there was a click on the line.

The number rang once and then he found himself listening to a conversation.

Once more the number rang and a voice answered.

It was several minutes before the number in London was ringing.