Many iPhone resellers are complaining about the huge demand of the iPhone and the shrinking inventory of the device.

In the past weeks, Apple stores throughout New York, Florida, California, Pennsylvania and other states across U.S. have received no iPhone shipments. However, when shipments do arrive, all iPhone units are bought within a day. Around end of March, the average Apple store was out of stock for the iPhone for more than a week, wherein the company lost 20,000 units of potential sales.

Apple spokesperson Steve Dowling said, “The company is working to replenish iPhone supplies as quickly as we can. Stores continue to receive shipments almost

Analysts are making up theories as to why the company’s leading product, iPhone, is short on inventories. Some say that Apple is gearing up to introduce the new version of iPhone as the company had a history of tightening its inventories on the current iPod around 60 to 90 days before the launch of a new iPod. Some say that Apple may have underestimated iPhone’s demand.

Some iPhones did not make the store shelves simply because they were stolen. About $150,000 worth of iPhone was stolen in a truck bound to HongKong, while two Apple employees were charged with stealing over 300 iPhones in the store.