Apple is expected to face weaker iPhone sales in December, with UBS analysts revising unit estimates down to 74 million and revenue to $67.2 billion, citing declining demand in China. The company's overall revenue forecast for the quarter has been cut to $120.8 billion, below market expectations, while earnings per share estimates have also been lowered. Despite challenges in device sales, particularly due to competition and regulatory issues affecting AI features, Apple's services revenue remains strong, helping to mitigate overall earnings declines.