The Nokia 105 is marketed as a super-durable, dirt cheap phone with a long battery life. It also appears to be the most popular device among ISIS' ranks for setting off bombs, NBC News reported.
The must-have cellphone for ISIS fighters in Iraq doesn't have apps or a camera, and ships for less than $30.
The small and simple Nokia model is frequently used as a trigger device to set off ISIS' improvised explosive devices, known as IEDs, according to a Conflict Armament Research report released last month.
As part of a study looking at civilian components in ISIS bombs, CAR documented 10 of the phones captured from members of the terror group in Iraq in December 2014.
The research showed the terror group "consistently" used the Nokia 105 above all others "in the manufacture of a specific type of remote controlled IED."
Jonah Leff, director of operations at CAR, told NBC News that the reason for the the preference is probably twofold: supply and convenience.