Lists of “secret phone codes” have circulated for decades: dial a string of stars and hashes and suddenly you can reveal hidden menus, test hardware or change network settings.
Some shortcuts are real. The problem is that old lists mix official diagnostics, carrier-specific commands, manufacturer engineering menus and codes that can change settings you did not mean to touch.
Google documents a Pixel repair-diagnostics code
Google’s own Pixel repair instructions currently document *#*#7287#*#* for opening the Pixel Repair Diagnostics App on supported Pixel phones while connected to the internet. That is the kind of code worth trusting: it is published by the manufacturer, tied to a specific purpose and supported by instructions.
Apple exposes diagnostics through supported procedures, not viral code lists
Apple documents a diagnostics mode used for Self Service Repair and service workflows. Its current instructions involve powering the iPhone off and using a specific button/connection sequence. For ordinary cellular problems, Apple directs users to Settings and carrier troubleshooting rather than a universal “magic” dial code.
A code can belong to the carrier, modem or manufacturer — not “Android”
Carrier service codes
Call forwarding, caller ID and balance commands can vary by network and country.
Engineering menus
Some manufacturers include internal test menus that are undocumented for consumers and can disappear after updates.
Diagnostic tools
Useful when officially documented for your exact model.
Destructive commands
Any code claiming to reset, erase or reconfigure the phone deserves extreme skepticism.
Never dial a “secret code” just to see what happens
Search the manufacturer or carrier support site for the exact code first. If the source cannot explain what the command does, whether it changes settings and how to reverse it, skip it.
The useful secret is documentation
Smartphones do contain diagnostic pathways. In 2026, the safest way to reach them is through current manufacturer instructions — not a copied list whose original phone model disappeared three Android versions ago.