Mobile phone coursework

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Thanks to deregulation, the regional BOC's Bell Operating Companies are scattered and do not communicate much with each other. Phreaks can take advantage of this by pretending to be mobile phone customers whose "home base" is a city served by a different BOC, known as a "roamer".

Since it is impractical for each BOC to keep track of the customers of all the other BOC's, they will usually allow the customer to make the calls he wishes, often with a surcharge of some sort.

The bill is then forwarded to the roamer's home Mobile phone coursework for collection.

Extract of coursework "Mobile Phones"

However, it is fairly simple with the correct tools to create a bogus ID number for your mobile phone, and pretend to be a roamer from some other city and state, that's "just visiting". When your BOC tries to collect for the calls from your alleged "home BOC", they will discover you are not a real customer; but by then, you can create an entirely new electronic identity, and use that instead.

How does the cellular system know who is calling, and where they are? When a mobile phone enters a cell's area of transmission, it transmits its phone number and its 8 digit ID number to that cell, who will keep track of it until it gets far enough away that the sound quality is sufficiently diminished, and then the phone is "handed off" to the cell that Mobile phone coursework customer has walked or driven into.

This process continues as long as the phone has power and is turned on.

If the phone is turned off or the car issomeone attempting to call the mobile phone will receive a recording along the lines of "The mobile phone customer you have dialed has left the vehicle or driven out of the service area.

If it is, the call will then act to the speaking parties just like a normal call - the caller may hear a busy tone, the phone may just ring, or the call may be answered. How does the switching equipment know whether or not a particular phone is authorized to use the network?

Many times, it doesn't. When a dealer installs a mobile phone, he gives the phone's ID number an 8 digit hexadecimal number to the local BOC, as well as the phone number the BOC assigned to the customer. Thereafter, whenever a phone is present in one of the cells, the two numbers are checked - they should be registered to the same person.

If they don't match, the telco knows that an attempted fraud is taking place or at best, some transmission error and will not allow calls to be placed or received at that phone. However, it is impractical especially given the present state of deregulation for the telco to have records of every cellular customer of every BOC.

How can one "phreak" a cellular phone? Most cellular phones include a crude "password" system to keep unauthorized users from using the phone - however, dealers often set the password usually a 3 to 5 digit code to the last four digits of the customer's mobile phone number.

If you can find that somewhere on the phone, you're in luck. If not, it shouldn't be TOO hard to hack, since most people aren't smart enough to use something besides "", "", or whatever. If you want to modify the chip set in a cellular phone you bought or stolethere are two chips of course, this depends on the model and manufacturer, yours may be different that will need to be changed - one installed at the manufacturer often epoxied in with the phone's ID number, and one installed by the dealer with the phone number, and possible the security code.

To do this, you'll obviously need an EPROM burner as well as the same sort of chips used in the phone or a friendly and unscrupulous dealer! As to recording the numbers of other mobile phone customers and using them; as far as I know, this is just theory Not what you're looking for?

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