All of the DNS related problems can be easily fixed by using a custom DNS server. On an iPhone, you can easily set a custom DNS server without installing any app.
Steps To Add Custom DNS Server On iPhone
🔹 Step 1: First of all, open the ‘Settings’ app on your iOS device.
🔹 Step 2: On the Settings page, tap on the ‘Wi-Fi’ option.
🔹 Step 3: On the WiFi page, tap on the (i) sign located behind the WiFi name.
🔹Step 4: On the next page, scroll down and find the ‘Configure DNS’ option.
🔹 Step 5: Tap on the Configure DNS option and select the ‘Manual’ option.
🔹 Step 6: Now tap on the ‘Add Server’ option and add the DNS servers there and tap on the ‘Save’ button.
🔹 Step 7: Once done, the WiFi network will re-connect.
✅ That’s it! You are done. This is how you can change the DNS server on an iPhone.