Users of iPhone find it difficult to switch off Wi-Fi and Bluetooth after they upgrade their phones to the latest operating system iOS 11, which may consume unexpected power and data traffic and bring potential security risks.
Industry insiders warned users to be more cautious before the system update and wait for further updates.
Besides new features and changes, the new iOS 11 has its own bugs and software problems, like every major release of iOS, such as poor Wi-Fi connectivity, random connection drops and slow Internet speed, according to media report and forum posts.
In China, people don't seem fond of the new Control Center, which can't really switch off Wi-Fi and Bluetooth features after disconnecting ongoing connections. The networks are still "ready" for new connections like other Wi-Fi networks and devices like Apple Watch.
With the new system, users find the setup "unfriendly and unclear" and out of battery within "three to four hours". Some tech-savvy users choose to downgrade the new system to the previous one, which is not recommended by Apple, according to posts in a Chinese social website.
"In an attempt to keep you connected to Apple devices and services, iOS 11 compromises users' security," said the Electronic Frontier Foundation.