Is it permissible to collectively recite the Qur’an on the phone for fear of falling into ostentation?

Riya' (showing off) resides in the heart. If a person intends by their worship to show off to people, then it is forbidden. However, if their intention is purely for the sake of Allah, there is no harm in it, even if people praise them for that action. Based on this, it is permissible to memorize and recite the Qur'an via phone with another person, and there is no prohibition in that if the intention is purely for the sake of Allah.