Computer Tricks and Secrets

Short answer: the classic Nokia secret codes belonged to those old feature phones and mostly do not work anymore, but some universal codes (like *#06# for IMEI) still work on almost any phone, and modern Android has its own useful codes. Here are the ones worth knowing today, plus the Nokia classics for nostalgia. Codes that still work on almost any phone *#06# , shows your IMEI number instantly (works on virtually every phone, essential if it is ever lost or stolen). That one is genuinely universal and useful, note your IMEI down somewhere safe now. Useful codes on modern Android Code What it does *#06# Show IMEI *#*#4636#*#* Testing/info menu (phone, battery, usage) on many devices Carrier USSD (e.g. *121#) Balance/data, varies by carrier Note: many old diagnostic codes are blocked on modern phones for security, and some vary by manufacturer, so not every code works on every device. The Nokia classics (for nostalgia) On the old Nokia feature phones, codes lik...