To reset your Samsung SIM PIN, you'll need your PUK (Personal Unblocking Key) if you've entered the PIN incorrectly three times, which you get from your carrier; otherwise, you can change the PIN in Settings > Security and privacy > Other security settings > SIM card lock, entering your current PIN and then the new one.
If you forgot or don't know your SIM PIN
The wrong guess can permanently lock your SIM card or eSIM, and then you would need a new SIM card or eSIM. If your device asks for a PIN or code that you don't know, here's what to do: Contact the carrier that gave you the SIM card or eSIM.
How to unlock Samsung phone if forgot the password:
A new SIM card usually comes with a temporary default PIN of 0123 or 1234. SIM card will be blocked if you enter incorrect PIN code for 3 times.
If you can't unlock your phone, you'll need to erase it. Then you can set it up again and set a new screen lock. If you can't sign in to your Google Account, learn how to recover your account.
The Samsung secret code *#9900# opens the SysDump menu, primarily used to delete temporary junk files (dumpstate/logcat) to free up space and potentially speed up your device, and also offers options like resetting battery statistics for better performance. It's a shortcut to system functions for maintenance, allowing users to clear logs and manage battery data, but should be used with caution as it accesses system-level functions.
Dialing *#7353# on a Samsung phone opens the Quick Test Menu, a hidden diagnostic tool that lets you quickly test various hardware components like the speaker, vibration motor, sensors (accelerometer, light), touchscreen, camera, and display colors, all through simple, one-tap options for basic troubleshooting. It's a handy way to check if parts of your phone are working without needing complex apps, though some codes may vary or not work on newer models.
What is the default PIN? The default PIN is set to 0000.
If you've forgotten your debit card PIN, some banks may offer a way to retrieve it through their website or app. You can also call a customer care representative, or find a local branch for help. You'll probably still need to verify your account ownership and may be directed to reset the PIN for security reasons.
SIM Lock Code Location Your PUK code is typically found on your SIM packaging or can be obtained from your carrier. Default SIM Unlock PIN Most SIM cards have a default PIN of 1234, which can be reset using a PUK if entered incorrectly multiple times.
A SIM PIN is a 4-digit code that you can set to protect your SIM and device from unauthorised use in case of being lost or stolen. By default, it is set to 1111 but we would recommend you set your own PIN as soon as you get your new SIM for your device.
After three wrong tries, your SIM automatically locks itself. You'll then see a message asking for your PUK code — short for Personal Unblocking Key. That PUK is an 8-digit code only your carrier can give you. Enter it correctly, and you can reset your SIM PIN.
Typing *#0*# (star-hash-zero-star-hash) into the phone dialer on a Samsung device opens a hidden General Test Mode, a secret diagnostic menu used for checking hardware components like the screen (touch, color), sensors, speakers, cameras, and vibration. It's a valuable tool for users to self-diagnose issues or verify a device's functionality, especially when buying a used phone, as it allows you to test functions like touch responsiveness, RGB colors, and sensor accuracy.
Here's the reality: Android phones don't have universal secret codes that magically unlock devices without deleting data. As "codes such as *2767*3855# or ##7780## trigger a factory reset" according to EaseUS, most "secret codes" just wipe your phone. That's why knowing these legitimate recovery methods matters.
Screen Lock Recovery
The “Forgot PIN/Password/Pattern” option on the lock screen is activated after 5 or more failed attempts to unlock the device. After using the "Forgot PIN/Password/Pattern" feature, if the previous lock method is entered incorrectly 3 times, no further attempts will be allowed.
Unfortunately, you can't find the SIM PIN code on your Android device, and entering the PIN incorrectly three times blocks your SIM card. You can unlock it but you must use a PUK (or PUC - personal unblocking code) for that, which you can get from your mobile operator.
The 4636 code is a secret diagnostic code that grants Android phone users access to system information. With this code, one can check their data usage statistics and other features which is not typically available through the standard user interface.
*#9900# If you dial this code on your keypad, a window will open where you can click on 'Delete dumpstate/logcat' to remove all junk files from your phone, making it a bit faster!
3️⃣ Dial *#2663# to refresh your Wi-Fi and boost internet speed. Click on TSP FW Update for touch screen firmware updates.
Get software and hardware info (*#12580*369#)
If you want to find your phone's software and hardware information, dial *#12580*369# to get the details instead of navigating through the Settings menu.
1. What does *#0*# do on Samsung? *#0*# is a Samsung secret code that opens a diagnostic mode for testing various hardware parts of the phone. It allows users to check the functionality of the screen, sensors, camera, speakers, vibration, and other components.