There were 4.3 billion robocalls received across the United States last month, said YouMail in a news release. On average, July saw 139.3 million robocalls per day and 1,612 robocalls per second. YouMail said the “most problematic robocall campaigns” in July revolved around pre-approved loan officers that claim to inform a consumer that they have qualified for a loan with relatively low monthly payments.