http://pages.ebay.com/link/?nav=item.view&id=262228278204&alt=web

https://www.wish.com/geek/m/c/56434488dfb6b128b953fdde

Gday, I am looking into buying a device simply for flying and controlling the camera/DJI App from my Phantom 3 Advanced that i recently purchased... i wanted to make sure before i purchased this device listed above, the DJI app and camera... etc will be compatable and the device will fit in the Phantoms mobile device holder of the controller. 

Which device would work best and be compatable with the app and camera...

Cheers.
Lachie

Take a look at the DJI GO APP requirements for the list of compatible devices here:
http://www.dji.com/product/phantom-3-standard/info#downloads

It currently reads:

DJI GO App
iOS Version v2.5.0. Requires iOS 8.0 or later. Compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, and iPad mini 3 Wi-Fi + Cellular. This app is optimized for iPhone 5s, iPhone 6, and iPhone 6 Plus.
Android Version v2.5.0. Requires Android 4.1.2 or later. Compatible with Samsung tabs 705c, Samsung S6, Samsung S5, Samsung NOTE4, Samsung NOTE3, Google Nexus 9, Google Nexus 7 II, Ascend Mate7, Huawei P8 Max, Nubia Z7 mini, Sony Xperia Z3, MI 3, MI PAD, Smartisan T1.
*Support for additional Android devices available as testing and development continues.

So will the devices that i have listed be compatable  with the DJI App and camera??? Is the hardware in these devive up to scratch and work.