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From: lindh@uhasun.hartford.edu (Andrew Lindh)
Newsgroups: sci.electronics
Subject: Re: free calls?
Message-ID: <280@ultrix.uhasun.hartford.edu>
Date: 6 Aug 90 05:50:59 GMT
References: <32457@cup.portal.com> <30@mq.UUCP>
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In article <30@mq.UUCP>, alan@mq.UUCP (Alan H. Mintz) writes:
> Each cellular phone has an ESN (Electronic Serial Number) and a MIN (Mobile
> ID Number or Phone Number). The two must match the record in the switch in 
> order for an incoming or outgoing call to be completed. These are usually
> stored in two separate places in the phone. The ESN is usually somehow
> affixed to the frame or buried or epoxied. The device that stores the MIN
> is easily changeable. You would have to change both to allow what you are
> talking about.

As I remember some phones have a RS-232 serial port that hooks to
am IBM and with special software you can read the ESN and MIN and
change the MIN. You could also get the status of the phone and other
stuff.....

You may be thinking..."Wow a RS-232 port!" well there are many chips
that are made that are a CPU with RS-232...I use them all the time.
The ones that come to mind are the simple Z8600 series.

(check out the Zilog Z8603...an old, but great chip....)
-- 
Andrew Lindh, a student at the University of Hartford -- Computer Science
INTERNET: lindh@uhasun.hartford.edu | NOTE: All views here are MINE!!!
BITNET:   lindh@hartford.bitnet     | Not the school's or those of anyone else!
UUCP:     lindh@uhasun.uucp         | ---- When will I graduate???     "SYNFU!"