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'[EE]: Cellular modem with programmable ESN'
2006\04\16@012816 by Charles Craft

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I've got a home project where a cellular modem would come in handy but don't want the recurring expense.

Has anyone worked with a cellular modem that allows you to program in a ESN?
If I could use the ESN of my cell phone then I wouldn't need a data plan for the modem and
odds are pretty good they won't be active at the same time.



2006\04\16@013607 by Bob Axtell

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Charles Craft wrote:
> I've got a home project where a cellular modem would come in handy but don't want the recurring expense.
>
> Has anyone worked with a cellular modem that allows you to program in a ESN?
> If I could use the ESN of my cell phone then I wouldn't need a data plan for the modem and
> odds are pretty good they won't be active at the same time.
>
>
>
>  
They are pretty strict about copying ESNs. Its a crime here in the USA
to do that, even just for testing.

--Bob

2006\04\16@105132 by Marc Nicholas

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On 4/16/06, Charles Craft <spam_OUTchuckseaTakeThisOuTspammindspring.com> wrote:
>
> I've got a home project where a cellular modem would come in handy but
> don't want the recurring expense.
>
> Has anyone worked with a cellular modem that allows you to program in a
> ESN?
> If I could use the ESN of my cell phone then I wouldn't need a data plan
> for the modem and
> odds are pretty good they won't be active at the same time.


You go buy a Telit or similar GSM module...take the SIM out of your
phone...pop it in the GSM module. ;-)

But seriously, find out if your local GSM carrier(s) offer data on their
prepaid plans.

-marc

2006\04\16@124443 by dbwood

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Cellular modems of the type you are speaking about require a service
provider. These types of cellular modems work by using a Mobile
Indentification Number (MIN), the modem's ten digit phone number.
There are specific ranges of these MINs owned by companies (such as
Cellemetry); your modem gets assigned one of these MINs. The service
provider then watches the mobile backbone (called AMPS) for MINs in
their ranges. When a MIN is detected, the service provider pulls the
MIN (and ESN) from the AMPS system and passes it along to you (at a
cost of about $0.05 per packet).

There is no reason why you couldn't put another device's ESN in the
cellular modem's data packet, but since the modem is uniquely
identified by its MIN, doing so would be a waste of time/space.

A word of warning: If you DO decide to use this type of modem, keep in
mind that if you transmit too often (Cellemetry modems use only the
control channel; MicroBurst modems use the control channel AND tie up
a voice channel, although they do not send any data over the voice
channel) your MIN will end up in "MIN Jail". Your MIN will then be
prohibited from send any data packets on the AMPS system for up to 24
hours. This is how AMPS prevents fraudulent use of MINs.

Douglas Wood

{Original Message removed}

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