Toi: The Halachah is that you can’t hold anything in your hands that you’re worried about dropping, because it will take away from your Kavanah. However, it’s Muttar for a D’var Mitzvah, therefore one may hold their Lulav and Esrog while Davening. If you’re using your electronic device as a Siddur, that should count as a D’var Mitzvah.
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