ANSWER:

This is not permissible at all. 

The followers must listen to the imam when he’s reciting the Quran. 

During taraweeh or tahajjud can the people in congregation behind the imam use the phone to read the translation of what the imam is reciting. For ex. If imam said he will recite surah ya seen in first raka and rahman in 2and. Can the congregation get their phones out and read the translation from quran apps while the salah is going on .?

Taraweeh, Tahajjud and Qiyam-ul-Layl | April 22, 2020 4:18 pm
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In ramdan last ten ,For tharaweeh our masjid the imam skip the witr and Prayed after thahajud . But the same time another imam lead witr after tharaweeh. So can I get full benefit of praying full night with the imam who skip witr after tharaweeh and and praying thahajud late night with witr.
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I’ve always wandered which worship I should prioritize before fajr if my time is limited to for example 30 minutes. Prayers, Quran recitation, dua, dhikr, etc. A bit of everything or a lot of some things? Is it better to do more prayers with short surahs or less prayers with longer surahs? Is it okay if I only make dua before fajr time?