Thanks to the runaway success of the iPhone, AT&T has the largest wireless network in the country — and the lousiest. Fed-up subscribers, who pay the telco about $30 a month just for data (and another $40 or so for voice), are planning an assault this Friday called Operation Chokehold.

The idea is to cripple AT&T’s network in order to draw attention to its weakness. To do so, participating iPhone users will run data-heavy applications over AT&T’s 3G network on Friday from noon to 1 p.m. Pacific time.

The plan was apparently launched by the Secret Diary of Steve Jobs, a popular blog that satirically impersonates the Apple CEO, but Operation Chokehold has since gained steam with notices popping up on other tech blogs.

It shouldn’t take much to buckle AT&T’s network — it has trouble functioning under normal conditions. Whether the company will do anything in response is another matter. Verizon has blanketed the country in ads mocking its chief rival’s network — ads that wouldn’t be so effective if they didn’t ring true. AT&T tried to sue, but gave up in the end.

The company promised to improve its network in New York and San Francisco — two known problem areas — but don’t hold out hope. AT&T appears as if it is looking for ways to discourage users from using its product — the network — or at least charging them more, according to wireless chief Ralph de la Vega. — PZS