Signals are finally getting stronger for the global smartphone market. Chinese handset makers like Huawei, which had been locked out of the race by U.S. sanctions, are dialing back in.

That adds up to a tricky outlook for Apple in China, its second-largest revenue region after North America. Huawei’s Chinese rival Xiaomi, which reported third-quarter results Monday, is also making a renewed push in the premium segment—Apple’s bread and butter.