By Daisuke Wakabayashi And Thomas Gryta 

In recent years, Americans have been spared the sticker shock of paying full price for a new iPhone because wireless operators offered upfront discounts approaching $500 a phone.

But Apple Inc. faces an uncertain new environment this week as it prepares to unveil new--and what are expected to be more expensive--iPhones. Carriers have been weaning consumers off subsidies and getting them to pay full price for new devices.

In most cases, consumers pay for the phones over time, the way many people buy new cars. The carriers say they come out ahead by eliminating the subsidies and allowing consumers to buy new phones without upfront payments.

The approach poses risks for Apple. Its phones are most popular in the countries where carriers subsidize the purchase price, principally the U.S. and Japan. Eliminating subsidies will allow consumers to see more clearly the price difference between Apple and rivals and could expose the iPhone maker to more of the pricing pressure plaguing its competitors.

"All those devices that are $600 or $650 do well because of the subsidies," said Carolina Milanesi, chief of research at Kantar Worldpanel. "Customers are starting to pay more attention to the prices."

Ms. Milanesi said the new installment plans should help boost U.S. sales of less expensive smartphones that use Google Inc.'s Android operating system because customers will be drawn to phones with similar specifications as the iPhone at half the price. Research firm IDC estimated that the world-wide average selling price of an iPhone will be $657 this year, compared with $254 for Android phones.

Apple is expected to unveil new iPhones on Tuesday with 4.7- and 5.5-inch displays, up from 4 inches for its current models. Analysts predict that Apple will charge as much as $100 more for the 5.5-inch model than the $649 base price for its current top-model, the iPhone 5S.

The four major U.S. wireless carriers-- AT&T Inc., Verizon Communications Inc., T-Mobile US Inc. and Sprint Corp.--began promoting no-subsidy installment plans last year. The plans aim to shift subscribers off a subsidy system that allowed them to buy a new iPhone 5S for $199, less than a third of the list price, with a two-year contract. Analysts expect the carriers to feature the new plans in marketing around Apple's new phones.

Apple and the carriers declined to comment.

The old system worked well for Apple. In the U.S. and Japan, where carriers have been offering the heaviest iPhone discounts, Apple's smartphone market share exceeds 40%, according to comScore and MM Research Institute. By comparison, iPhone's global market share was 12% in the second quarter, according to research firm IDC.

Under a subsidized plan, a customer typically pays $200 up front for a base model of the iPhone 5S and roughly $80 a month for a common service plan. The carriers make back the cost of the discount through the monthly fees.

A typical new installment plan charges $27 a month for two years to finance the same phone--about equal to the base price of the phone--plus $65 a month for similar service. Consumers own the phone outright after the two years and can continue using it by paying only for the service.

Over two years, consumers tend to pay more to the carriers under the new plans.

Consumers who have paid off their phones will have to decide whether having the latest device is worth increasing their monthly bills. For a family of four, a set of new iPhones would add more than $100 to the monthly bill.

The move away from subsidies was sparked by T-Mobile, which also started offering a program last year for customers to trade in their phones after a specified period and begin financing a new device. All the other major carriers now offer similar plans but also have the option of traditional contract-based plans and pricing. As of the end of June, about 44% of AT&T's U.S. postpaid smartphone users were on no-subsidy service plans.

Apple Chief Executive Tim Cook said the company already was seeing a move away from subsidies. In the quarter through June, fewer than 25% of iPhones were sold on a subsidy plan. "That number is markedly different than it would have been two years ago," he told analysts in July.

Mr. Cook said the installment plans make it easier for customers to switch to new phones, so "that makes us incredibly bullish that customers on those plans would be very likely to upgrade when we announce a new product."

By eliminating the $200 upfront fee to buy a new high-end iPhone, more customers may be interested in an iPhone because the financial sting is spread over monthly payments. Carriers also are offering customers who remain under old contracts--who would normally have to wait to get new phones--options to upgrade to new handsets if they switch to installment plans.

"In the short term, getting a device for zero down is only going to be helpful," said Ben Schachter, an analyst with Macquarie Capital. "Over the long term, people may start to pay more mind to how much they are paying each month."

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