(Reuters) - Apple Inc’s shares fell nearly 3 percent on Thursday on signs of weak demand for the iPhone 8 that caused analysts and investors to question the company’s staggered release strategy for its latest phones.

Wireless carriers in the United States and Canada have reported slow third-quarter customer upgrades. While some expect a pickup after the iPhone X goes on sale in November, others cautioned that phone’s high price tag could weigh on demand.

The chief executive of Rogers Communication, Canada’s largest mobile network, on Thursday said appetite for the iPhone 8 and 8 Plus, which went on sale in September, had been “anemic,” the latest sign of weak sales for those phones ahead of the Nov. 3 launch of the pricier iPhone X.

But some analysts said overall phone production looked in line with their earlier expectations, and that it is unclear whether weak iPhone 8 sales would hurt iPhone revenue and margins because users may still be buying more profitable older models with more memory.

Verizon Communication Inc’s Chief Financial Officer Matt Ellis said the number of third-quarter phone upgrades fell versus previous years, but that he expected an upgrade surge when the iPhone X is released.

“I think what you’re seeing there is a difference in timing of some of the new devices coming out versus what we’ve historically seen,” Ellis told an earnings call.

“As we get into the holiday season, some of those new devices come out, we think we will see strong demand.”

The uncertainty about demand coupled with a Taiwan media report of a cut in iPhone 8 production pushed Apple shares down 2.8 percent by midday.

“The Street is hyper-sensitive to any speed bumps around this next iPhone cycle and (that) speaks to the knee-jerk reaction we are seeing in shares,” said Daniel Ives, chief strategy officer at GBH Insights in New York.

FILE PHOTO: An iPhone 8 is displayed at the Apple Orchard Shop in Singapore September 22, 2017. REUTERS/Edgar Su

“iPhone 8 demand has been naturally soft out of the gates with the main event being the iPhone X launch in early November. (But) this is the early innings of what we believe is the biggest iPhone product cycle with X leading the way.”

U.S. wireless carrier AT&T said last week its third-quarter postpaid handset upgrades were down by nearly 900,000 from a year ago.

SUPPLY CHAIN

Apple no longer gives regular updates on sales numbers, but indications from supply channels, wireless carriers and analysts help shed light on demand.

When Apple announced the plan to release both phones before the end of 2017, fans were disappointed they would have to wait until November for the iPhone X.

But there are also concerns that the more expensive phone marking the iPhone’s 10th anniversary may see a muted reception compared to the frenzy that normally greets Apple phone launches.

A carrier store survey suggested the cheaper iPhone 7 was outselling its successor just a month after iPhone 8’s launch, KeyBanc Capital Markets analyst John Vinh said this week.

But it can be hard to gauge iPhone revenue and profits from model sales numbers alone because Apple can earn attractive margins when customers switch into higher-memory devices, said Wayne Lam, analyst with IHS Markit.

“They’ve always been able to use that as a lever to improve their profitability on the iPhone,” Lam said.

There are also worries that the relatively high price of the iPhone X may discourage carriers from stocking the inventory and customers from ultimately buying the phone.

Rogers’ CEO Joe Natale said anticipation for the iPhone X was high but noted inventory would be limited and that, at Apple’s starting price of $999, it was an expensive device.