I couldn't install hola coins wallet why this

is there any option to make sd card as default storage??

what is the purpose of s bike??? when i drive a bike i use headset for listening musics and for take calls... but when i activate the s bike i couldn't play or listening musics...

when i get android 7 nought ... make it fast.... marshmallows sweetness is fading day by day...

i couldn't not use my sd card... every time the device ask to encrypt or decrypt my sd card... first time i encrypted... but the process is not completed.... after i couldn't access my ad card... what should i do?