Hidden Smartphone Codes & Hacks: Secret iPhone & Samsung Galaxy Tricks (2026)

Hidden Smartphone Codes & Hacks: Secret Features Your Phone Brand Isn't Telling You

Hidden Smartphone Codes & Hacks Secret iPhone & Samsung Galaxy Tricks (2026)

Listen, we all shell out hundreds of dollars every few years for the latest smartphone.

Whether you swear by Apple or stick to a trusty Samsung Galaxy, you probably think you know your device inside and out. You send texts, scroll social media, take pictures, and charge it when the battery hits red.

But here is the thing: your phone is hiding dozens of secret tools from you right now.

Manufacturers don't exactly broadcast these features in the user manual. Some are hidden behind secret keypad combinations called USSD dialer codes, while others are buried five menus deep in your phone's developer settings.

I spent the past few weeks testing these codes and hidden settings on both Android and iOS devices. Some made my phone run noticeably faster, while others revealed weird technical details I didn't even know existed.

So, grab a drink, grab your phone, and let’s dive into the best secret features sitting on your screen right now.

What Are USSD Codes and Why Do They Exist?

Before we start typing random symbols into our phone dialers, let's clear up what these codes actually are.

USSD stands for Unstructured Supplementary Service Data. That sounds super technical, but it’s just a fancy word for secret shortcut codes built into cellular networks and mobile software.

Back in the early days of mobile phones, engineers needed a quick way to test hardware without clicking through menus. They created short number combinations starting with asterisks and hashtags.

When you dial these codes on your keypad, your phone bypasses normal apps and talks directly to the system hardware or your carrier’s network.

Universal Secret Codes That Work on Almost Any Phone

Let's start with the basic codes that work whether you own an iPhone, a Samsung Galaxy, a Google Pixel, or a Xiaomi device.

1. The IMEI Instant Checker (*#06#)

This is probably the most famous secret code on the planet, but so many people forget it exists.

Open your phone's dialer app, type *#06#, and you don't even need to press the call button. Your phone will immediately display your International Mobile Equipment Identity (IMEI) number.

• Why you need it: If your phone gets lost or stolen, your carrier needs this number to block the device.

• Pro tip: Write this number down on a piece of paper and keep it at home. Searching through settings when your screen is broken or lost is a massive headache.

2. Check Call Forwarding Status (*#21# or *#67#)

Ever worry that someone might be secretly redirecting your phone calls or text messages?

Dialing *#21# gives you an instant report on your phone’s call forwarding status. It tells you if voice calls, data, or SMS messages are being forwarded to another number when your phone is turned off or unreachable.

If you want to check what happens specifically when you reject a call or when your line is busy, dial *#67# instead.

iPhone Secret Codes & Hidden Hacks

Apple loves to keep its user interface minimal, but that also means some of the coolest features are tucked away where you’d never look.

The Field Test Mode (3001#12345#)

Type *3001#12345#* into your iPhone keypad and hit call.

This unlocks Apple's hidden Field Test Mode menu. Instead of looking at those vague signal strength bars in the top corner of your screen, this menu shows your actual signal performance measured in decibel-milliwatts (dBm).

• If your signal strength is around -50 dBm to -70 dBm, you have a rock-solid connection.

• If it dips below -110 dBm, you are in a dead zone and calls will drop.

Turn the Back of Your iPhone into a Hidden Button

This isn't a keypad code, but it is one of the coolest hidden iOS features out there.

Go to Settings > Accessibility > Touch, and scroll all the way down until you see Back Tap. You can set your iPhone so that physically tapping the back logo twice or three times triggers an action.

You can make a double-tap take a screenshot, turn on the flashlight, or open your favorite app instantly. It feels like magic once you get used to using it.

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Samsung Galaxy Secret Codes & Hardware Diagnostics

Samsung phones are famous for having tons of hidden menus built into their One UI software. If you own a Galaxy phone, these two codes are absolute gold.

1. The Secret General Test Menu (#0#)

If you are buying a used Samsung phone or suspect your speaker or touch screen is acting weird, dial *#0*#.

This opens up Samsung’s hidden Hardware Diagnostic Panel.

You get a grid of square buttons that let you test individual components:

• Red, Green, and Blue tiles: Checks for dead pixels on your display.

• Touch: Lets you trace lines across your screen to test touch sensitivity.

• Vibration: Tests the vibration motor inside the phone.

• Receiver & Speaker: Tests call audio and main speaker volume.

2. Battery Health & Dump Mode (*#9900#)

Dialing *#9900# opens the SysDump menu.

While you shouldn't tap random options here without knowing what they do, there is one very useful setting called Batterystats Reset. If your Samsung battery is dropping rapidly from 20% to 0%, resetting battery stats can help recalibrate your phone's power meter.

Hidden Android Settings That Speed Up Your Phone

To be honest, the best performance hacks on Android aren't dialed on the keypad. They are hidden inside a secret menu called Developer Options.

Every modern Android phone comes with Developer Options disabled by default so regular users don't break their settings. Here is how to unlock it in less than thirty seconds.

Step 1: Unlock Developer Options

1. Open your phone's Settings app.

2. Scroll down and tap About Phone.

3. Find Build Number and tap it seven times in a row fast.

4. You'll see a pop-up saying "You are now a developer!"

Step 2: Make Your Phone Feel Twice as Fast

Now go back to the main Settings screen, tap System, and select Developer Options.

Scroll down until you find these three specific settings:

• Window animation scale

• Transition animation scale

• Animator duration scale

By default, all three are set to 1x. Change all three of them to 0.5x or turn them off completely.

This speeds up the visual animations when opening apps, switching menus, or swiping back. Your phone won't actually have a faster processor, but it will instantly feel twice as fast because you aren't waiting for fancy screen animations to finish.

Privacy Hacks Your Phone Brand Kept Quiet

Let’s face it, our phones collect a massive amount of personal data every single day. Luckily, there are a few built-in toggles that stop apps from watching your every move.

Hide Your Caller ID for Private Calls (#31#)

If you need to make a phone call to a business or stranger and don't want them saving your mobile number, you can block your caller ID on demand.

• Simply dial #31# followed immediately by the phone number you want to call (for example: #31#1234567890).

• Your number will show up on their screen as "Private Number" or "Unknown".

To turn caller ID blocking back off for normal calls, just dial *31#.

Turn Off Sensor Access Entirely (Android)

Did you know Android has a master kill-switch that completely disables your camera, microphone, and GPS sensors all at once?

Inside Developer Options, look for a setting called Quick Settings Developer Tiles. Toggle on the switch named Sensors Off.

Now, when you swipe down your quick notification shade at the top of your screen, you'll see a new "Sensors Off" icon. Tapping it completely cuts physical power to your phone’s camera and mic until you turn it back on.

Quick Reference Guide: Top Phone Codes at a Glance

If you don't want to memorize every code, here is a quick cheat sheet you can bookmark or screenshot:

Code	Platform	What It Does
*#06#	Universal	Displays your unique IMEI number
*#21#	Universal	Checks overall call forwarding status
*3001#12345#*	iPhone	Opens Field Test Mode for signal analysis
*#0*#	Samsung	Opens full hardware diagnostic menu
#31# + Number	Universal	Hides your caller ID for that outgoing call
*#9900#	Samsung	Opens SysDump menu to clear cache/reset stats

Don't Be Afraid to Experiment

Most smartphone owners only ever use about 10% of what their device can actually do.

While typing random codes into your keypad can feel a bit like hacking into a main computer in a movie, these shortcuts are completely safe to try as long as you read what each code does.

Start by checking your IMEI number, speed up your Android animation scales, or set up Back Tap on your iPhone. You'll immediately feel like you got a brand-new phone without spending a single dollar.

Which secret code or setting are you going to try first?