Apple Inc is expected to report iPhone sales increased slightly more than 1% in the holiday quarter when it announces earnings on Tuesday, its slowest growth ever and far from the double-digit growth investors have come to expect.

The iPhone 6S and 6S Plus, which boasted  when they , are now facing weak demand, according to analysts, because they have than their popular predecessors.

The new iPhones also face tough comparisons with the strong sales of their older siblings.
Apple tapped into a crucial market when it unveiled its bigger-screen iPhone 6 and 6 Plus phones in 2014, grabbing the attention of Asian customers, who had previously lapped up phablets from players such as Samsung Electronics.

“Apple has become a victim of their own success as the blockbuster iPhone 6 product cycle was hard to replicate as many customers are either buying an older, cheaper iPhone 6 or waiting for the iPhone 7,” FBR Capital Markets analyst Daniel Ives said.