My friends and I all got these in high school a year or two before mobile phones become commonplace: https://www.youtube.com/watch?v=WuBXphPuEuk https://www.yo

My friends and I all got these in high school a year or two before mobile phones become commonplace: https://www.youtube.com/watch?v=WuBXphPuEuk https://www.youtube.com/watch?v=WuBXphPuEuk They came with a little codebook and kids would extend with their own codes. EDIT: It also came with a voicemail that you could access with a freecall so you could leave each other voice messages too. It was pretty awesome.