Why am I unable to move apps to SD Card from internal memory in Android 5.1.1 Sony Xperia T 2 Ultra?

[AC Question]

unable to move apps to SD Card from internal memory in Android 5.1.1 Sony Xperia T 2 Ultra?

Since I bought new Xperia T2 ulta i am unable to move apps from internal memory to SD card. Apps like Whatsapp , IMO, Line are all in internal memory if even my camera picture are saving in internal memory after setting its default to SD Card.
Please help. .