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What mobile operating system is the Fire OS used by Amazon’s Kindle Fire devices based on?
Android
What is the accelerometer used for in mobile devices?
Several devices, part of the quantified self movement, use accelerometers. An accelerometer is an electromechanical device used to measure acceleration forces. Such forces may be static, like the continuous force of gravity or, as is the case with many mobile devices, dynamic to sense movement or vibrations.
What port is utilized by secure IMAP?
IMAP uses port 143, but SSL/TLS encrypted IMAP uses port 993.
What identifies a SIM card if the card is used?
A small chip needed in order to utilize GSM or LTE networks. IMEI (International Mobile Equipment Identity): ICCID (Integrated Circuit Card ID): a unique number that identifies a SIM card if the card is used.
Photo in the article by “Wikimedia Commons” https://commons.wikimedia.org/wiki/File:Wikiappandroid.jpg