Over the past couple of days, many AT&T customers have been wondering if the company had imposed a new speed cap on uploads for devices that supports HSUPA. Many iPhone 4 users were reporting that their upload speeds had dropped significantly, down to the levels of previous iPhone devices, as you can see in the speed test above. As it turns out, AT&T says this is a software bug in some of their Alcatel-Lucent equipment, and that they are working on a fix:
AT&T and Alcatel-Lucent jointly identified a software defect — triggered under certain conditions – that impacted uplink performance for Laptop Connect and smartphone customers using 3G HSUPA-capable wireless devices in markets with Alcatel-Lucent equipment. This impacts less than two percent of our wireless customer base. While Alcatel-Lucent develops the appropriate software fix, we are providing normal 3G uplink speeds and consistent performance for affected customers with HSUPA-capable devices.
Unfortunately, no word on when that fix will be deployed.
Read More | AllThingsD