Praying from a Smartphone

Is it permissible to pray from a smartphone?

It is not permissible to pray from a smartphone, as it distracts from concentration due to constant notifications, etc. Even if you switch it to airplane mode, there is a concern that it will disrupt your focus because it is expensive, and you will worry about it falling. (See source) Moreover, it does not appear as standing before the King of Kings, the Holy One, blessed be He. (This does not constitute permission to use a smartphone)

Mishnah Berakhot, page 23, side 2: "Our Rabbis taught: A person should not hold tefillin in his hand and a Torah scroll in his arm and pray." In the Gemara there: "Shmuel said: A knife, money, a bowl, and bread are similar items." Also in Sukkah 41a, it is explained that it is permissible to hold a lulav in one's hand during prayer, as it is a mitzvah and does not distract. In explaining the difference between a lulav and a Torah scroll and other items, Rashi in Sukkah writes that a lulav, since it is a mitzvah, is not a heavy burden, unlike a Torah scroll and tefillin, which are not a mitzvah in themselves. The Shulchan Aruch, Orach Chaim, siman 96, paragraph 2, states: "It is permissible to hold a prayer book in one's hand during prayer, as it is used for the prayer itself and does not distract, similar to a lulav, which because it is held for a mitzvah, does not distract."

It seems that a phone is not similar to a prayer book, which the Shulchan Aruch permitted, as the prayer book is solely intended for prayer, and therefore, when praying with it, it is for the mitzvah, and there is no concern that it will fall and be damaged. But with a phone, there is certainly concern that it will fall and be damaged, as it is not intended for prayer.