DHL Global Mail's customer service number in the United States as of 2014 is 317-554-5191. Its lines are open to receive calls Mondays through Fridays, from 8 p.m. to 9 p.m. Eastern time, and it closes on Saturdays, Sundays and holidays.
DHL shippers usually provide an online tracking link to check the status of a shipment without having to call the customer service line. The DHL website also has online tools for shipment tracking, depending on the area where the parcel was sent from.
To track shipments from within the United States online, log on to DHL's Global Mail portal. There are separate websites for checking Global Mail shipments from the Asia Pacific region or from any other country.