More than 20 million other smartphone users are on the AT&T network, but other phones do not drain the network the way the nine million iPhones users do. Indeed, that is why the howls of protest are more numerous in the dense urban areas with higher concentrations of iPhone owners.
“It’s almost worthless to try and get on 3G during peak times in those cities,” Mr. Munster said, referring to the 3G network. “When too many users get in the area, the call drops.” The problems seem particularly pronounced in New York and San Francisco, where Mr. Munster estimates AT&T’s network shoulders as much as 20 percent of all the iPhone users in the United States.
Owners of the iPhone 3GS, the newest model, “have probably increased their usage by about 100 percent,” said Chetan Sharma, an independent wireless analyst. “It’s faster so they are using it more on a daily basis.”
Mr. Sharma compares the problem to water flowing through a pipe. “It can only funnel so much at a given time,” he said. “It comes down to peak capacity loads, or spikes in data usage. That’s why you see these problems at conferences or in large cities with high concentration of iPhone users.”
When thousands of iPhone owners descended on Austin, Tex., in March during South by Southwest, an annual technology and music conference, attendees were unable to send text messages, check their e-mail or make calls until AT&T installed temporary cell sites to amplify the service.
by Jake Hertz
by Jake Hertz
by Aaron Carman