How to: Make your Phone number appear to be an empty number or couldn’t be connected

iPhone

Make it empty number

1 Bring up the dial panel

iPhone - Dial panel
iPhone – Dial panel

2 Enter following code then press the green dial button

**21*888888#

iPhone **21*888888#
iPhone **21*888888#

3 After a message following screen will appear

iPhone - Notification screen
iPhone – Notification screen
iPhone - Notification screen
iPhone – Notification screen

4 Now try to call your number from other phone, you will hear message like “Your call could not be connected, please check the number and try again.”

Note: Your phone will not receive any notification until you reverse the change

Reverse the change (Make the number back to normal)

1 Bring up the dial panel again

2 Enter following code, then press green dial button

##21#

##21#
##21#

3 After a message following screen will appear

iPhone - Notification screen
iPhone – Notification screen
iPhone - Notification screen
iPhone – Notification screen

4 Now try to call your number from other phone again, it’s back to normal now

Android

For android, the process is very similar to iPhone.

To Enable this function

Use following code then press dial button

**21+123456# (123456 should be the number you want to forward to)

To revert the change

Use following code then press dial button

#21#


How to: Solve math equation/Algebra step by step? Mobile App and Windows Software

Are you an student? Trying to resolve an math equation? Don’t know how to resolve it even the final answer is in front of you? Read on! πŸ˜‰

Microsoft created two free Math tools which can help you to get the answer, even better, it can show you step by step resolution, so that you understand and learn how to get the final answer rather than copy the final answer.

Microsoft Math Solver

With this mobile app, we can input math equation by three ways:

  • Scan from writing (Take photo from exercise book etc.)
  • Handwriting directly within the App
  • Enter the equation by using builtin math keyboard

It will then return final results with steps which you can expand and learn.

Microsoft Math Solver
Microsoft Math Solver
Microsoft Math Solver - Snap and Solve
Microsoft Math Solver – Snap and Solve
Microsoft Math Solver - Draw and Practice
Microsoft Math Solver – Draw and Practice
Microsoft Math Solver - Explore and Learn
Microsoft Math Solver – Explore and Learn
Microsoft Math Solver - Steps
Microsoft Math Solver – Steps
Microsoft Math Solver - Steps
Microsoft Math Solver – Steps
Microsoft Math Solver - Graph
Microsoft Math Solver – Graph
Microsoft Math Solver - Handwriting
Microsoft Math Solver – Handwriting
Microsoft Math Solver - Built-in math keyboard
Microsoft Math Solver – Built-in math keyboard
Microsoft Math Solver - Built-in math keyboard
Microsoft Math Solver – Built-in math keyboard
Microsoft Math Solver - Resolve
Microsoft Math Solver – Resolve
Microsoft Math Solver - Scan
Microsoft Math Solver – Scan
Microsoft Math Solver - Resolve
Microsoft Math Solver – Resolve
Microsoft Math Solver - Resolve
Microsoft Math Solver – Resolve
Microsoft Math Solver - Resolve
Microsoft Math Solver – Resolve
Microsoft Math Solver - Final Answer
Microsoft Math Solver – Final Answer

Microsoft Mathematics

This free software can be used on Microsoft Windows to resolve math equations.

Microsoft Mathematics
Microsoft Mathematics
Microsoft Mathematics - Main Window
Microsoft Mathematics – Main Window
Microsoft Mathematics - Resolve linear equation in two variable
Microsoft Mathematics – Resolve linear equation in two variable
Microsoft Mathematics - Resolve linear equation in two variable, Steps
Microsoft Mathematics – Resolve linear equation in two variable, Steps
Microsoft Mathematics - Resolve linear equation in two variable, Steps
Microsoft Mathematics – Resolve linear equation in two variable, Steps

Keywords: Solve math equation, solve linear equation, solve linear equation in two variable, solve math problems, software, application, app, computer program, free, Algebra


iGoat – A Learning Tool for iOS App Pentesting and Security (Open Web Application Security Project – OWASP)

iGoat is a learning tool for iOS developers (iPhone, iPad, etc.) and mobile app pentesters. It was inspired by the WebGoat project, and has a similar conceptual flow to it.

As such, iGoat is a safe environment where iOS developers can learn about the major security pitfalls they face as well as how to avoid them. It is made up of a series of lessons that each teach a single (but vital) security lesson.

The lessons are laid out in the following steps:

  1. Brief introduction to the problem.
  2. Verify the problem by exploiting it.
  3. Brief description of available remediations to the problem.
  4. Fix the problem by correcting and rebuilding the iGoat program.

Step 4 is optional, but highly recommended for all iOS developers. Assistance is available within iGoat if you don’t know how to fix a specific problem.

Vulnerabities Covered (version 3.0):

  • Key Management
    • Hardcoded Encryption Keys
    • Key Storage Server Side
    • Random Key Generation
  • URL Scheme Attack
  • Social Engineering
  • Reverse Engineering
    • String Analysis
  • Data Protection (Rest)
    • Local Data Storage (SQLite)
    • Plist Storage
    • Keychain Usage
    • NSUserDefaults Storage
  • Data Protection (Transit)
    • Server Communication
    • Public Key Pinning
  • Authentication
    • Remote Authentication
  • Side Channel Data Leaks
    • Device Logs
    • Cut-and-Paste
    • Backgrounding
    • Keystroke Logging
  • Tampering
    • Method Swizzling
  • Injection Flaws
    • SQL Injection
    • Cross Site Scripting
  • Broken Cryptography

More on: https://github.com/owasp/igoat


iPhone Not Backed Up / iPhone Backup Failed

“This iPhone hasn’t been backed up in xx weeks. Backups happened when this iPhone is connected to power, locked and on Wi-Fi”

“You do not have enough space in iCloud to back up this iPhone.”

Keywords: Turn off icloud backup, icloud not enough space

1 Tap on Settings icon.

iOS -> Settings icon
iOS -> Settings icon

2 Tap on your name at the top (If prompted, enter the Apple ID and password then tap Sign In)

iOS -> Settings -> Name
iOS -> Settings -> Name

3 Tap on “iCloud”

iOS -> Settings -> Name -> iCloud
iOS -> Settings -> Name -> iCloud

4 Tap on “iCloud backup”

iOS -> Settings -> Name -> iCloud -> iCloud Backup
iOS -> Settings -> Name -> iCloud -> iCloud Backup

5

 iOS -> Settings -> Name -> iCloud -> iCloud Backup -> Turn off
iOS -> Settings -> Name -> iCloud -> iCloud Backup -> Turn off

Note: Turning off the iCloud will stop your phone from backing up to iCloud automatically (Thus nor more complain about insufficient space). You might want to backup your phone manually just in case.

Free Wireless Screen Mirroring (Windows, Android, iOS)

Keywords: Free, Wireless Screen Mirroring, Miracast, Airplay, Windows, Android, iOS, remote control, Apple, Microsoft Windows

LetsView
LetsView
  • Free
  • Easy to use
  • Easy to install

More detail from official website: https://letsview.com/

Windows download: https://download.aoscdn.com/down.php?softid=letsview

Android download: https://download.apowersoft.com/letsview.apk

iOS download: https://download.aoscdn.com/down.php?softid=iosletsview

Completely Restore/Reset iPad (Clear/Wipe everything) With DFU(Device Firmware Update) mode

Keywords: iPad, DFU, Device Firmware Update, iPad recover mode, Wipe iPad, Clear iPad, Erase iPad, Factory reset iPad, Recover iPad, iPad frozen, White Apple Logo, Stuck with White Apple Logo, Rescue iPad

Sometimes iPad can have problems, e.g. Screen is black or frozen. (Make sure it is not out of power)

You can try to hold Power button and Home button to reset it. (This way iPad will lose anything)

If holding the Power button and Home button doesn’t work, you might need to use DFU mode to reset it (This way, the iPad will lose everything, after it’s done, it will be like a new one)

Items you will need to have before starting:

  • The iPad with issue
  • PC/Mac with iTunes installed
  • USB cable to connect iPad with PC/Mac

Here is how:

1 Hold the power button and home button, the iPad will tun off, do not release the buttons

2 When the White Apple logo appears, only release the power button, still holding the home button.

3 The DFU mode should appear, release all buttons.

4 Connect iPad with PC/Mac

5 Open iTunes

6 It will ask if you want to “Update” or “Restore” (If the iPad is not running the latest version)

7 You can try “Update” (Update should keep the settings)

8 Fail that, you need to select “Restore” (This will wipe the iPad, you will lose everything on that iPad), it should bring your iPad to live though.

How to properly remove/release supervised Apple devices

*This method only suitable for Administrators who enrolled device with Apple Business Manager or Apple Business Manager and third-party MDM services.

*With this method, Mac computers can’t be added back once released.

Login to Apple Business Manager: https://business.apple.com

Click Device Assignments in the sidebar and choose the method for device disownment

Select Release Devices from the Perform Action pop-up menu, then click Done

Make sure read the pop-up carefully.

Click Release.

Click OK.

Now reset the device, the Remote Management will not show while setting up the device.

Proceed with setup, now the device is release from Apple Business Manager and MDM (Mobile device management) server.

Alternatively, you can release the device from MDM service if you have configured allow MDM server to do so.

More details from Apple:
https://support.apple.com/guide/apple-business-manager/release-devices-asmec4d28461/web