Various iPhone models may exhibit extremely slow data throughput when connected to Wi-Fi networks. This can result in sluggish loading of web pages, YouTube content and more.
Fix
This problem can often be solved by simply changing DNS servers. On your iPhone, while connected to a Wi-Fi network, follow these steps:
- Go to Settings > Wi-Fi
- Tap the blue arrow next to the currently connected Wi-Fi network
- Tap DNS, then delete the current entries and enter the following: 208.67.222.222, 208.67.220.220 (or you can try Google’s public DNS servers: 8.8.8.8, 8.8.4.4)
- Tap return