There were so many calls call made regarding the Chino Hills Earthquake, yesterday, that service to wireless and landline customers was disrupted, reported the Los Angeles Times. Although there was not damage to equipment, the increased calling stressed services.

Sprint reported a 800% hike and Verizon's volume soared .to 40% above peak expected during disasters. Emergency disaster called spiked to the point that "Office of Emergency Services urged people to curb non-emergency calls because they could cause 911 calls to be blocked."

By mid-afternoon phone services returned to near normal levels.