Is it allowed in Islam to load Quran into smart phone as pdf or audio format

Can someone please answer my following questions:

-is it allowed to load Quran into smart phone as pdf or audio format?

-if loading allowed then is it allow to read or listen Quran from smart phone without wudhu?

-can i touch or keep the smart phone in my pocket if Quran is loaded in it as pdf or audio format when i don't have wudhu?

-is it allowed to enter toilet when i have the smart phone in my pocket where Quran is loaded as pdf or audio format?

-can i recite without wudhu any verse/Sura of Quran that i memorized?

It would be good if you can provide any reference of Quran and Hadith for it or at least any fatwa or book by well known Arab Sheikh.

jazakallah khairan

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