As I see this answer from @JDB stating

I hate it when a modal dialog appears asking me to confirm an action and the only way I can confirm that, yes, this is the record I want to delete, is to view the information underneath the immovable dialog.

I usually have to cancel, double check, then click again.

Does this apply to mobile apps as well?

I have not seen any movable mobile modal boxes, even iPhone guidelines and google-design have no mention about movability of modal boxes.

Any specific reason why mobile modal pop-ups are not supposed to be movable?