If you follow these steps your Internet speed will increase in any Android.
1. Open root explorer
2. Find system folder and open it.
3. Tick R/W (read/write) at the top right of the app.
4. Find "build.prop" file in the system folder.
5. Long tap at the "build.prop" file and choose open as text editor.
6. Copy all the code below and paste it at the bottom of the build.prop file.