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Mobile telephones and Dejan Kaljevic

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This web page was intended to be the definitive story about Dejan Kaljevic, but while there is much reference to his name on the internet, there is very little about the man save that he is an electronics technician from Belgrade and that he has given his name to a cable, electronics and software for unlocking mobile telephones. From time to time the webmaster receives cryptic emails and guest book entries which would indicate that he does read this web page. There is a web site from the Serbia in the Balkans (that is south east Europe for those of you who inhabit in the USA) called Maybe it is he. There does not seem to be a photograph of him anywhere. Presumably brought up in the Soviet era he feels that he needs to be careful. There are two main software/hardware configurations for a mobile telephone, DCT3 and DCT4. DCT3 is the older system which was cracked 3 years after its introduction. The software is now free. DCT4 is the newer system on the newer high end telephones. Systems to crack the DCT4 are available but still very expensive.

Mobile telephones are little computers with a small screen and keyboard which include a radio transmitter and receiver and a microphone and an earphone. Under software control they can communicate with the many radio towers which have been built on top of tall buildings all around the world. These radio towers are connected by cables to the conventional land telephone lines.

Hicard from Singtel in Singapore is the best service ever. It offers a *131* roaming service so that the telephone can make and receive telephone calls in nearly every country. But then Singapore is one of the best countries.

When a mobile telephone is first switched on it searches for the nearest radio tower and registers you with the central computer. When you move to another location you will be automatically connected to the next radio tower. Thus your movements can be tracked.

Tomahawk cruise missile Osama bin Laden Mobile telephones are not the same as satellite telephones which work anywhere and communicate with a satellite and not a radio tower. As with a mobile telephone your movements can be tracked. The United States once launched a Tomahawk missile at Osama bin Laden in Afghanistan locating his position from his satellite telephone. He now has no electrical equipment at all. a mobile telephone tower

There are many different telephone companies offering mobile telephone services at different prices. Your telephone will only work if it is in range of a radio tower which recognises your telephone. Some telephone services are prepaid and for others the user receives a bill. Often the prepaid service cannot telephone to another country.

For financial reasons the provider of the mobile telephone service would like you to buy a mobile telephone from him and not to change to another provider should they give a better or cheaper service.

Most service providers do not manufacture telephones but ensure that manufacturers make telephones especially for their service.

There are a number of ways of doing this and all of them can be overcome. In fact the providers themselves are beginning to recognise this and are starting to remove the locks on their telephones.

It is rather like selling car radios with security numbers which for a fee can be unlocked so that a thief can now use a stolen car radio. So why bother to lock the radio.

a serial connection to a Nokia 3310
with the SIM card inside a parallel connection to the printer port for a Nokia 3310
with the SIM card removed If you want to get started with this sort of thing you will need to puchase the Dejan flasher cable for your make and model of mobile telephone.. There are 2 types of cable for every different model of telephone, serial and parallel. You also need to download some suitable software to do what you want to do. Some software uses the serial cable and some the parallel cable. The serial cable is identified by a 9 pin D female connector and plugs into a serial port on the back of your computer. A serial cable can operate in two modes M and F. The switch needs to be in the M position. (Mbus and not Fbus.) The parallel cable is identified by a 25 pin D male connector and plugs into the printer port. The serial port on older computers accepted a 25pin D female connector and there is a converter from 9 pin to 25 pin to enable an older machine to accept a modern serial cable.
circuit diagram of a Dejan flasher cable circuit diagram of another type of Dejan flasher cable

These cables have interface circuits contained in the connectors, either the 25 pin D connector or the telephone connector. At least they must invert and alter the voltage levels of the signals from RS232 -12 volts (high) to +12 volts (low) to transistor transistor levels, 0 volts (low) to 3 to 5 volts (high). There is also a timing pulse to be synchronised.

There are many programs available on the internet for accessing the memory of a mobile telephone, some of them quite legal and some of them in a grey area. Some of them can seriously damage your mobile telephone.

Your PC and your telephone both contain microprocessors and memory and can talk to each other via one of these cables. Your telephone contains two memories, a flash memory which is a chip fixed inside the telephone and a SIM card, a type of PIC card which can be removed and programmed separately. It identifies the telephone with information such as your telephone number and your friends telephone numbers which you have stored. When you switch on your mobile telephone it sends a copy of its memory to the serial out pin on its connector and if that pin is connected via a cable to a PC running a suitable program the PC will acquire a copy of the telephone memory. The same can be done in the opposite direction. The memory will contain the software or program which makes the telephone work and the data such as your telephone numbers.

It is probably a good idea to start with a non destructive program like Oxygen available as a free trial version from This program requires a serial connection and for the SIM card to be inserted. When you are familiar with this you can move on to Rollis Version 4.78, which can unlock a mobile telephone, without too much risk of damage. This program requires a parallel cable and no SIM card. The telephone must be switched off and the on/off button pressed briefly. The earlier version was Rollis Version 1.7, which is very dangerous and needs a some skill to operate but can do everything. This program requires a serial cable and no SIM card. The telephone must be switched off and the on/off button pressed briefly. It is interesting that the earlier version has more features than the later version, but that the later version includes many flash partials, while the earlier version was much smaller and contained none.

rolis4.78 Nokia telephone unlocker, the best.
Used to click here for download.
But now sorry withdrawn becaues it does not run on Windows XP, NT or 2000.
Mobile telephones contain a microprocessor, flash memory and a sim card. Flash memory is computer memory where a computer program can be stored and remain stored when the power is switched off. It can also be written to under the control of another computer so that the program can be stored. All mobile telephones have a socket on the inside where a plug can be inserted connected to a cable to usually the serial port of another computer such as a laptop or desktop.

The sim card stands for the System Identity Module. It too contains some memory storage and the telephone number. It is supplied by the service provider and not the telephone manufacturer.

If a telephone is locked the software may not accept the SIM card. If it does accept the SIM card, the service provider may refuse to accept the telephone and SIM card combination. Every telephone has a unique IMEI, International Manufacturers Equipment Identity, number. This number is stored in the flash memory and so can be changed. It is illegal to do this in most countries.

pinouts for a Nokia 3310 purchase Dejan flasher cables from Micro Mayhem Dejan Kaljevic has given his name to the cable, the Dejan cable.

There is now a vast market in cables and software and flash partials the new computer code used to overwrite the supplied code. It is even possible to purchase some hardware, a flasher box, to connect on the end of the cable and unlock the telephone without another computer. They tend to be expensive.

screen from Rolis version 1.7b - click for download - 
Neo: 'If you ever get caught using this...'
Troy: 'I know. This never happened' Each make of telephone requires a different solution. Nokia telephones are particularly difficult and very popular. Each telephone of the same make requires a different solution depending on the version number of the software. The version number of the software can be determined by typing *#0000# on the telephone and the IMEI number can be determined by typing *#06#. Further information can be found by typing *#92702689# (or *#war0anty#).

Further information will be provided as it becomes available. There is very little information about the types of microprocessors used and the assembler instruction code.

Useful links

The situation is very fluid and changes day to day. While every effort is being made to keep these links valid, many links may not be working at this time. It is interesting that most of the technical hacker sites are from eastern Europe (Czech republic, Poland etc.), while the practical step by step technical sites are all from England. Either the United States does not have the problem or such information is banned.

Some useful links (they become obsolete quickly - they will be updated quickly) - new Dutch telephone unlock company. - oxygen phone manager for Nokia telephones. Practice with this first.  All in Croat. Not quite sure why this link is here. - new link all about Nokia data cables - all about programming SIM cards

Page updated on March 4th. 2017. You are visitor number  number of hits

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