Kansas City, Mo. ? Sprint Corp. introduced a plan Monday to address wireless customers’ criticisms about how much they’re charged for extra time they spend on their cell phones.

The plan allows customers who exceed their 300 so-called “anytime minutes” to pay $2.50 for additional 25- to 50-minute blocks.

Currently, many wireless customers sign one- or two-year contracts in which they pay a set amount each month to receive a block of anytime minutes and unlimited — or nearly unlimited — night and weekend minutes. But customers who use up their anytime minutes may be charged up to 50 cents a minute for additional time; Sprint customers pay up to 40 cents a minute for more time.

Under Overland Park, Kan.-based Sprint’s new plan, customers pay $35 and get 300 anytime minutes, plus unlimited night and weekend minutes. Customers who use extra anytime minutes will pay $2.50 for 25-minute blocks (a cost of about 10 cents a minute for those who use up all 25 minutes), until they reach about 650 minutes. Then, $2.50 will buy them 50-minute blocks (or about 5 cents a minute for those who use up the entire block). Once customers have used 1,250 minutes, they must pay 7 cents a minute for more time.

“The price-per-minute comes out roughly the same as our bucket plans,” said Len Lauer, president and chief operating officer of the firm.