How To Run 2 Apps At Same phone -:
1. Download Parallel Space from Google Play Store
2. Open Parallel Space Android app in your Phone.
3. To add a new app in this app, tap on the plus icon (+)at the bottom of the app and you will see a list of all the apps installed on your phone. Now select any of the apps.(If you want to run two Facebook account select Facebook app or you can do this thing with any app)
4. Start Apps in Parallel Space
Now your selected apps will be added to the parallel space and you will be able to configure as a newly installed app in your android phone. WhatsApp, Facebook, Messenger, Twitter and lots of off worked very well in this app. There is no limitation on the number of apps you can run in parallel space.