AT&T

Well, that didn't take long. Only hours into the iPhone 4 pre-order period, US pre-ordering is down. Whether you're attempting to pre-order through Apple or AT&T, for the time being, you're likely to find yourself unable to complete the process. What's the reason? Overload. As has happened multiple times in the past, either Apple, AT&T or both, underestimated the technical requirements necessary to handle demand for the iPhone.

Many of you who have recently tried the Apple Online Store route have like found yourselves staring at a spinning cursor as the Apple store attempts to contact AT&T to determine your eligibility for an iPhone upgrade, which in turn determines the price that you'll be charged to complete your pre-order. Unfortunately, after what seems an eternity of staring at that spinning cursor, most are met with the message seen above, which apologetically informs you that "Your request couldn’t be processed. We’re sorry, but there was an error processing your request. Please try again later."

In mid-April AT&T Wireless subscribers will have the option of purchasing their own personal 3G cell phone tower. The MicroCell will run $149.99 and is fully compatible with the iPhone 3G and 3GS. The devices will be rolled out in different markets over the next few months.

The MicroCell is a solution for users who have little or no 3G coverage in their home and access to a broadband Internet connection. The device allows users to make calls and send text messages against their AT&T Wireless account using a 5,000 square foot personal 3G network.

In a dramatic improvement since last spring, AT&T has defeated the three closest competitors in a PCWorld speed and reliability challenge. Carriers Sprint, T-Mobile and Verizon were also tested for download and upload speeds in thirteen cities.

AT&T won download speed tests against all competitors everywhere except for Denver and Phoenix, where the carrier lost to T-Mobile by a slight margin. Reliability scores for AT&T were highest in Phoenix, Portland and Seattle, where they topped out at 100%.