$4.99

Details

  • Released
  • Updated
  • September 20, 2010
  • September 21, 2023

Features

Blue Box video #1 for iPhone
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Blue Box screenshot #10 for iPhone
iphone
ipad
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About

Encode and decode DTMF signals using your device's microphone or keypad. Play back tone sequences with adjustable settings, and save them for easy recall. Explore various tone systems, including trunk control and coin signals, for educational and utility purposes.

Encode/decode DTMF signals
Adjustable tone, delay, and volume
US, UK, and European tone systems
Multi-frequency and trunk control tones
Coin tone sequences (Red Box mode)
Custom tone creation
Save and organize sequences
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What's New in Blue Box

5.1.3

September 21, 2023

The audio category was changed to ignore the mute switch.

User reviews

Works great

First: If you’re having trouble with this app… be sure to slide the switch on the side of your phone to in-mute it. If your phone (or iPad) is muted, it can’t generate nor decode audio.

To the developer: Great UI design. I’m using this in my telephone systems class and it’s great.

Thanks for writing such a great app.
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I second “app name misleading”

If only the author could get the correct tone matrix for the Blue Box.

Wikipedia and other sources have the list of tones required. It should be easy to fix.

Does not work for me

Unfortunately this app does not work for me. After switching from dial to listen back to dial the output seems to be muted. Need to restart the app to regain output again. Listen mode only picks up noise, but no actual tones. Tried to adjust settings, but it got only worse. Installed a different app to decode tones which worked out of the box.
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All the tones you need

Idk why this didn’t work at first. Without updating it now works. Sorry for the poor initial review!

For those who know what this is

I'm really happy and very surprised that this exists. Works very well. Only phone phreaks know what this is really used for, or what it used to be able to be used for.

Developer apps

FAQ

What is Blue Box used for?

Blue Box is a utility for encoding and decoding DTMF (Dual-Tone Multi-Frequency) or Touch Tone signals. It allows you to generate tones using a keypad or decipher them using your device's microphone, useful for interacting with systems like answering machines or dial-up services.

Does Blue Box have ads?

No, Blue Box does not contain advertisements. It is a paid application that offers its full functionality without interruptions from ads.

What tone systems does Blue Box support?

Blue Box supports US, UK, and European based DTMF systems. It also includes additional trunk control signals and special tones like Dial Tone, Ring Back Tone, Busy Signal, and 2600Hz.

Can Blue Box play tones during a phone call?

No, Blue Box cannot play tones into the iPhone phone feature while in an active call. It is designed for use when not on a call or for other audio output scenarios.

What are the limitations of Blue Box's decoding capabilities?

Blue Box's software-based decoding can be processor intensive, and performance may vary. Tones less than 100 ms with pauses less than 100 ms can be difficult to process. For higher speed decoding, a hardware solution is recommended.

How does Blue Box handle saving tone sequences?

Blue Box features a Favorites feature that allows you to save and organize any number of tone sequences. This makes it easy to recall and play back frequently used combinations.

What is the Red Box mode in Blue Box?

Red Box mode in Blue Box allows you to play coin tone sequences. This includes 5¢, 10¢, and 25¢ for the US system, and 10p and 50p for European systems, useful for simulating coin-operated interactions.

Is Blue Box suitable for all devices?

Blue Box is supported on iPhone, iPad, and iPod. However, performance may vary between devices due to its processor-intensive software-based decoding.