FIX DUAL SIM 3G
1.decompile framework.jar from firmware where there is this support and framework.jar firmware where you want to add.
2.With the help of the program Beyond Compare.
3.very convenient and you can see where everything is and how it differs) open those decompiled jar files (their catalogs) to compare and you copy from framework.jar (where there is a switching function), all telephony folders in your framework. jar. This of course is not quite right and from the professionals seem very silly, but I do not know what files need to edit, so I produce stupidly replacement. After going back your framework.jar.
4.Decompile your Phone.apk and using Beyond Compare 3 compare with files from this archive (attached below) (open files that are in the archive and see how they differ from those in our Phone.apk and add these differences in the corresponding our file Phone.apk).
5.Compile Phone.apk. Now replace our new framework.jar and Phone.apk.
If interested in this platform mtk6589 I can advise simply port the firmware from Jiayu G5, there comes already integrated switch.
Then go multilingual assembly each week.