My school kid has a quite usable āmechanicalā phone (designed for elderly people, with emergency calls, itās part of their emergency kit) but it has a hardcored number of possible characters for a voucher of 12 digits. All vouchers we had so far have 16 digits⦠š¤Ø
[a photo of the phone: itās a high contrast bar shaped phone with basically four preset numbers as mechanical keys and no number pad, the screen shows that 12 digits are expected]