Apple Intelligence is only available in English-speaking countries, creating an opportunity for Chinese phone makers like Xiaomi and Vivo, which had a 'remarkable' quarter, IDC says.

Phone sales are losing ground while the industry is growing worldwide. Success in China is particularly important to Apple's future.

Apple Inc.’s iPhone sales declined about 5% globally in the final quarter of last year, hurt by underwhelming upgrades and competitors making inroads in China.