Like my marriage, which was a series of bad calls.

A series of calls, however, would possibly be perceived as something more.

It brought a series of calls from around the area.

Funding was made available through a series of competitive calls for applicants.

He jumped on the phone and made a series of calls.

He went to the telephone and began making a series of calls.

She said the department would examine its telephone records to determine whether the girl's family and friends had made a series of calls to officials.

From then on, they receive a series of menacing calls.

They give a series of high-pitched calls on a single note, and tend not to fear human approach.

However, a series of calls to a number in London caught his attention.