The Associated Press reports, and Stop the Cap! can confirm AT&T is allowing some of their long-standing customers to switch back to unlimited data plans, even if they gave them up after the company introduced cheaper, limited data plan options.

After our regular reader “PreventCAPS” sent word AT&T was relenting on some requests for unlimited data plans, we spent some time late this afternoon with Jim Scott, an AT&T customer from New Rochelle, N.Y. as he navigated his way through AT&T customer service trying to get back to an unlimited data plan.

“When AT&T offered customers new, cheaper data plans, I never knew those replaced the unlimited option and I thought I could save some money downgrading to a cheaper data option,” Scott told us.

But Scott discovered the plan allowances he got didn’t save him money at all, because he exceeded them.

“I am a contractor and I spend all day on my phone moving large image files and even video of work being done on the properties I manage,” Scott says.  “Two gigabytes didn’t cut it.”

Scott tried to switch back to his unlimited plan this summer, but was told he could not, as it was no longer offered.

Enter Verizon Wireless, which is keeping its unlimited service plan at least temporarily as it introduces the Verizon iPhone.  Verizon’s imminent iPhone has become leverage for customers who want to turn the tables on AT&T.

“Thanks to AT&T’s greed, I had already made the decision to dump them for Verizon when my contract ends in February,” Scott says. “AT&T works fine in this part of New York, and the only reason I am leaving is because they don’t have a wireless data plan that met my needs.”

We worked with Scott and suggested he threaten to cancel his AT&T service and walk his future business to Verizon Wireless.  We asked him to make sure to tell AT&T the reason he was planning to cancel his service was because of the end of unlimited data option.

On a three-way call with AT&T customer service, AT&T promptly offered to restore Scott’s access to its discontinued unlimited data plan.

“All I had to say was ‘Verizon’ and ‘iPhone’ and the customer service representative immediately starting clacking away on her keyboard, and I had my unlimited data plan restored in less than five minutes,” Scott said.

The AP reports the key to success is having been a previous subscriber to AT&T’s unlimited data option.  New customers who signed up after June 2010 never had that option, and AT&T has refused to offer unlimited data to these customers.

Because newer customers are under relatively new contracts, actually following through on a threat to drop AT&T is an expensive proposition with early termination fees still well into the hundreds of dollars.  For those closer to a penalty-free exit, AT&T recognizes many of these customers already have one foot out the door.

Jose Argumedo, of Brentwood, N.Y., told the AP he and a friend were switched to an unlimited plan recently after they called AT&T’s customer service. Both have iPhone 4s, and previously had earlier iPhone models.

AT&T spokesman Mark Siegel wouldn’t confirm the option to return to an unlimited plan.

“We handle customers and their situations individually, and we’re not going to discuss specifics,” he said.

Scott says he is comfortable with his iPhone, but getting back an unlimited data plan was more important than the handset.

“If I can use the iPhone as leverage against these guys, why not?” Scott says.  “They’ve had me under their thumb for more than six months now with overlimit fees — now the table is turned.”

Stop the Cap! advises customers who want to follow in Scott’s footsteps get organized before calling:

1. Be sure to note the number of years you have been an AT&T customer;
2. Explain you used to have unlimited data and now want that plan back;
3. Tell them you are prepared to drop AT&T, even at the risk of a cancellation fee, if they don’t restore your access to the unlimited data plan.

If a representative is unable to make the switch, or doesn’t have information about how to switch you back, ask for a supervisor or hang up and call back.