Older iPhones can now be traded in at Apple stores in U.S.

Starting Friday, iPhone customers in the U.S. will be able to get credit for functioning older models at Apple stores, not just at electronics retailers like Best Buy that already have trade-in programs, the company said.

1st trade-in program run by Apple to give credit toward new iPhone for older models

Older iPhone models like the 3G can now be traded in at official Apple stores for credit toward newer models. (Brian Snyder/Reuters)

Excited about the new iPhone expected to be unveiled Sept. 10? Apple will now join others in allowing you to trade in your old model.

The company said starting Friday that it would give customers credit for functioning older models at Apple stores in the U.S. The credit can be used toward the purchase of a new iPhone, which will be activated in the store.

It didn't say how much older phones would be worth. But other brokers such as Gazelle.com offer anywhere from $10 for a working iPhone 3G to $350 for an iPhone 5 that is in pristine condition.

Similar trade-in programs are run by retailers, including Best Buy, Target and Radio Shack.

It was not clear Friday when the trade-in program would be available in Canada.