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An attendee shows off an iPhone X at an event at the Steve Jobs Theatre in California in September. Apple unveiled its most important new iPhone for years to take on Samsung and other competitors. Image Credit: Bloomberg

Apple Inc. earnings this week will confirm what most investors have finally accepted: The iPhone X didn't live up to the hype.

The results should also provide clues on the company's next strategy for its most-important product.

Chief Executive Officer Tim Cook and other Apple executives have a "major prove-me" period ahead, beginning with a new sales forecast and a conference call with analysts on Tuesday, GBH Insights analyst Daniel Ives said.

Apple shares down

He and other analysts cut their iPhone sales estimates, and Apple stock is down almost 8 percent in the past two weeks.

Apple CEO Tim Cook launched the iPhone X on October 27, a new flagship phone the company hopes will keep it on top of the smartphone market. - Bloomberg

Concerns were fanned by suppliers reporting weak demand for high-end handsets, another sign the smartphone boom that made Apple the most-valuable company is ebbing.

Market share

It's also under pressure in China, where some consumers are shunning pricey iPhones and local rivals like Oppo and Vivo are grabbing market share.

On Tuesday, Apple is expected to report fiscal second-quarter iPhone unit sales grew just over 2 percent from a year earlier.

From left: iPhone 8 Plus, iPhone X and iPhone 8 models are displayed during an Apple launch event in Cupertino, California, on September 12, 2017. - Reuters

For the fiscal third quarter, unit sales will be down 5 percent year-over-year, according to average analyst forecasts compiled by Bloomberg.

Expectations were higher when Apple launched new phones late last year. However, the iPhone 8 and 8 Plus looked similar to the iPhone 6 and 6 Plus models from about three years earlier.

Mahesh Pallival of Mumbai hires a band and holds a placard that read ‘I love iPhone X’, to pick up his phone from an electronics shop. - ANI / Twitter

The iPhone X had a bright, edge-to-edge display and 3-D facial recognition, but the $999 starting price was too much for some consumers.

That left a hole in the market for a breakthrough iPhone close to the previous price — and Apple is already working on filling this demand.

The company is preparing a new lower-cost iPhone that looks similar to the iPhone X and has some of its most-appealing features, Bloomberg News reported earlier this year.

Lower-priced iPhone X

"That lower-priced iPhone X, essentially, should be a successful product. That launch itself could move iPhone sales up 5 percent a year," said Gene Munster, co-founder of Loup Ventures and a longtime Apple analyst. Still, he warned that the days of 15 percent annual iPhone growth are over.

When the X launched last year, Apple paid handsomely for the new Face ID system, stainless steel casing and sharper, more efficient OLED screen technology.

$999 phone

The iPhone X's parts cost $115 more than the iPhone 8's, according to a November analysis. That made it difficult to price the product much below $999, without slicing Apple's legendary profitability.

The new, lower-cost iPhone will use an LCD display that's about half the cost of the OLED screen in the iPhone X.

It's also likely to use an aluminum casing versus stainless steel. That could bring the price close to $700, a level that's proven successful for many years.

In addition, Apple will launch a giant iPhone with a 6.5-inch screen and an update to the current iPhone X size, people familiar with the matter told Bloomberg News earlier this year.

While results on Tuesday will likely show slower Apple growth, this broader iPhone strategy could revive sales when the new devices come out toward the end of 2018.

For most companies, one product facing growth headwinds wouldn't be a concern.

Saturated market?

For Apple, the iPhone generates about two-thirds of sales, and the other third comes mostly from products and services best used with an iPhone. Here are some of the key numbers to watch on Tuesday:

Bernstein analyst Toni Sacconaghi said weakness in the current iPhone lineup was caused by a structural slowdown in the growth of new customers and the high pricing of the X model.

A saturated smartphone market means Apple can't do much about the first problem, but its pricing strategy can vary depending on the specific iPhones being offered.

"The rumored lineup could quickly change, and pricing remains a wild card "" Apple appears to have somewhat mis-estimated price elasticity this time around, but what might they change going forward?" Sacconaghi wrote in a recent note to investors.