45 lines
2.7 KiB
Plaintext
45 lines
2.7 KiB
Plaintext
PART I. WHAT IS BROADCAST FROM A CELLULAR TOWER?
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When a cellular phone makes a call, it normally transmits it's
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Electronic Security Number(ESN),Mobile Identification Number(MIN),it's
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Station Class Mark(SCM) and the number called in a short burst of data.
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This burst is the short buzz you hear after you press the SEND button and
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before the tower catches the data. These four things are the components
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the cellular provider uses to ensure that the phone is programmed to be
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billed and that it also has the identity of both the customer and the
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phone.
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There are usually two cellular phone companies in an area. One is
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the wire-line carrier (Band B), which is usually Bell, and the other is the
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non-wireline carrier (Band A). Within the two bands are 832 cellular phone
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channels. Each one has 416 bands, and within the bands are voice channels
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that actually transmit and receive information from cellular phones.
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The ESN and the phone number (MIN) are the two primary identifiers
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for any cellular phone. By changing both, the cellular carrier will accept
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the call and bill it to either a wrong account or provide service based on
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the fact that it is NOT a disconnected receiver. It will also look at the
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other two components, in order to insure that it is actually a cellular
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phone and to forward billing information to that carrier.
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The Station Class Mark can also be changed if you wish to prevent
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the cellular carrier from determining the type of phone that is placing the
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call. By providing the cellular tower with a false SCM, the cellular
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carrier, the FCC, or whoever happens to chase down cellular fraud is often
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looking for a particular phone which in reality is not the phone they are
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looking for. For example, you can provide the SCM for a Radio Shack phone,
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when in reality you are using a Novatell (How this is done from changing
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the SCM I do not know...remember...I didn't write this).
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The Number Assignment Module (NAM) also has the SIDH (System
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Identification for Home System) number programmed into it. Refer to SIDH
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TABLE. The transmittal of the SIDH number tells the carrier where to forward
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the billing information to in case the user is "roaming". The SIDH table
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tells the major cities and their identifying numbers. Changing an SIDH is
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programming job that takes only minutes, but be aware that the ESN is still
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sent to the cellular phone company. After they realize that the ESN is
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connected to either a fake number or a phone that is not in the network, they
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will block service. They only way around this is to reprogram the ESN.
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