Apple is expected to report its fourth quarter earnings on Tuesday. Yet BGC Financials analyst Colin Gillis says a good iPhone sales number this quarter could actually mean bad news for December's report.
"The key number for Apple is going to be the forward guidance for the December quarter, because that is where the [comparisons] become so difficult," Gillis told "Fast Money" traders last week. "And if there is any hint that the iPhone cycle is beginning to slow, it's going to pull the stock lower."
Apple decided to roll out the iPhone 6s/6s Plus in China in September, stumping many analysts tracking the iPhone sales growth. Last year Apple waited until December to make the iPhone 5s/5c available in China making comparisons challenging.