You need to root your phone to do this trick.
For Galaxy Wonder users, click here to root if you haven't root your phone.This Trick works in any rooted android phones.You need root explorer to do this trick.
How to increase internet speed in android?
Follow steps below to increase your internet speed.
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.