MePhone4S appears visually similar to MePhone4, his predecessor. He is a black rectangular phone with a silver casing surrounding his sides. On one side, he has two volume buttons and a ringer switch, and on his top is a power button. He has a large screen on his front which has a red glowing wallpaper with a pair of square-shaped sunglasses. He has two cameras, one on his front and back, as well as a receiver above his screen, and a home button below it. On his back is a large white Meeple logo.
MePhone4S first appeared on the show as a major threat to MePhone4, his main objective was to terminate him and replace him. However, once 4S returned, he had a safer and more caring attitude towards MePhone4, his mission changing to protect MePhone4 from the upcoming MePhone5. MePhone4S's original attitude was harsh and savage, showing he enjoyed the death and suffering of contestants. His return first did display this personality but changed once the real topic of MePhone5 came into play, he became very protective and disregarded his previous harsh attitude.
MePhone4S has Siri and is the only one shown having Siri. Siri calls MePhone4S' her master and can manifest objects, as seen in 4Seeing the Future. Siri likes him and treats him with respect.
MePhone4S has been shown to have a talking hand, shown when he says "talk to the hand" in an episode. The hand says hello. Not much is known why he has this but it has only appeared in Season 1. In Season 2, MePhone4's new hand isn't seen talking anymore. A possible reason was explained in a live stream, where they said, "He cut off his pinkie finger, which was where the hand's brain was." Whether this is canon or just a joke is unknown. It's also unknown if the talking hand has a gender, but he is presumed to be male, like MePhone4S.
- He is based on the terminator from the Movie "The Terminator".
- Along with MePhone6 and MePhone6+, MePhone4S is one of the only Meeple devices not voiced by a unique actor.
- MePhone4S is the latest MePhone that has a normal mouth.
- MePhone4S' talking hand has a voice similar to the Mine Turtle from ASDFmovie.
- MePhone4S is the only Meeple device known to have Siri.
MePhone4S is confirmed to be rare protagonist.