1. Download hex editor.
2. Open small street and Note down your glu credits.
3. Then open hex editor.
4. Go to location: data/data/com.glu.smallstreet/gameinfo.sav
5. Click on that location. Now click your phone menu button and press the 'find' function.
6. Search your number of glu cred. If it is 3 you input number '03'. Your result should be in the row 000000008.
7. Now change your number to ff. This gives you enough creds to last quite a while. Oh! And remember to press save in the menu.