Ladybug

The Ladybug is a phone for small kids, it has only two keypads, one is to call home and other to call 911 making it only for emergenices. Greg got this phone in Dog Days on his birthday by his parents, the only time Greg used it was when his dad was taking him to a baseball game and he thinks that Frank was going to sell him, so when his Dad goes out he quickly calls 911 and his dad almost gets arrested, Frank might have thrown it after that because it was never seen again.

In the film, Greg gets it from Rowley's parents as a birthday gift. The only time he used it was when he wanted to escape from Rowley's cabin then presses the home button but says it can't take the call then tinkers with the cell phone and accidentally presses the 911 button, Greg didn't notice it and said that he has to escape from there and just then the police come to the cabin and tackle Mr.Jefferson who had a knife in his hand to cut bread, they thought that he was hurting someone and he almost gets arrested.

Trivia

 * It appears to be a parody of Firefly mobile phone.