Mobile Phone

Mobile phones are a mode of communication that appear in the Compilation of Final Fantasy VII. Functionality wise, they operate roughly the same as real-world mobile phones.

Final Fantasy VII: Advent Children
The first actual appearance and use of mobile phones as communication devices are shown here. They show considerable hardiness, as Cloud's phone was waterproof to an uncertain depth, playing back voice messages while sinking to the bottom of a lake before it ceased to function. Loz's phone managed to withstand the impact force from the fight between himself and Tifa in the church.

Before Crisis -Final Fantasy VII-
While not actually seen, the mobile phones (called handsets) are the main source of communication between the Turks. In game art, Tseng has been portrayed with a mobile phone in his hand.

Crisis Core -Final Fantasy VII-
Mobile phones, again called "handsets", are seen as a standard issue among SOLDIER members. Angeal, Zack and Sephiroth have been seen using these handsets, and Zack often receives calls from his superiors and friends through his handset. It can be assumed that the Menu (or at least, the Missions Menu) is what Zack reviews on his mobile phone screen, as Angeal had accessed his phone in that way to abort a training session in the prologue. The phones also have a wireless connection with shops, allowing Zack to purchase or sell items.

Trivia

 * The mobile phone designs are recognized as the Panasonic P900iV, which were made for DoCoMo and will not be sold outside Japan. Cloud has been depicted in a Panasonic poster with his phone in hand, although none of the Final Fantasy characters have been seen using the camera option that is featured.
 * Loz's ringtone is the beginning snippet of the Victory Fanfare version used in Final Fantasy VII, which plays after Tifa Lockhart narrowly wins a fight with him in Aerith's church. This ringtone has since been circulated over the internet for anyone interested and able to use it for their own mobile phones.