Why cant u transfer apps on to my sd card

I have a Alcatel idol 4 and I can't transfer apps to my sd card if someone knows how to do it please help me thanks

Welcome to Android Central! Not all phones support the ability to Move Apps to SD. On top of that, even for phones that do support it, not all apps can be Moved to SD. If your phone doesn't support this function, then you'd have to root it and use an app like Link2SD or App Mgr III.