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Q: Cell phone voice record remote voice alteration ( No Answer,   3 Comments )
Subject: Cell phone voice record remote voice alteration
Category: Computers
Asked by: travel2468-ga
List Price: $20.00
Posted: 19 Oct 2006 11:16 PDT
Expires: 18 Nov 2006 10:16 PST
Question ID: 775078
There is a (actually several) recording (in a room) on my cell phone
that was created by using the " voice record " option on the cell
phone.   On original review the voices were very distorted.  Weeks
later, some voices were very clear on original recording, and later
recordings were very clear and voices were understandable.  The
content was preposterous to have happened.  Is it possible that a cell
phone memory of recording could be altered remotely, afterall they are
tower activated to function. Moreover, altered with "sound-alike"
voice imaging to where the replaced voices replecate people??  Could
this happen???
There is no answer at this time.

Subject: Re: Cell phone voice record remote voice alteration
From: barneca-ga on 19 Oct 2006 17:52 PDT
hi travel2468,

it depends on whether or not you got this cell phone from a mysterious
british gentleman known only as "Q".

doesn't it seem more likely that the speaker on your phone is on the
fritz, and whatever was wrong got jostled back into position and fixed
itself?  or you charged your battery?  or something similar?  even if
it were possible (which i'm 99.97% sure it isn't), who exactly do you
suspect of taking the time to upload your voice memo, filter it, and
download it back into your phone?  what would their motivation be?

Subject: Re: Cell phone voice record remote voice alteration
From: audiothink-ga on 23 Oct 2006 16:20 PDT
Yes, it is technically possible to manipulate the files on a cell
phone from a remote location. A phone capable of internet
transmissions (e.g., one that contains a 56k modem, is capable of
Verizon Wireless, etc.) or bluetooth is vulnerable to file
manipulation, which would include voice recordings, software, even
firmware. A cell phone is, after all, a computer and should be
considered prone to malicious attack. Consider the possibility that
someone gained physical access to your phone, then: updated its
firmware to communicate with a malicious tower; installed hidden
software that surreptitiously transmits/receives data; and hijacked
your firewall.

Thus an intruder might have pulled your original voice recordings,
distorted them with an audio editor, then pushed the new versions back
onto your device in place of the original versions. All of this is
technically possible, even if your phone does not have internet
capability (for another explanation of why this is possible, consider
the scenario in which an attacker's tower pretends to be a cell telco
tower; then pushes a firmware update; then hacks your files).

While technically possible, a remote compromise is statistically
improbable. Few people know how to p0wn cell phones and even fewer who
could p0wn a phone without physical access. Unless you are an elite
individual guarding valuable secrets, the likelihood of attack is
miniscule. Telco encryption algorithms and other privacy measures are
truly daunting, crackable only by an elite group of clever, determined

Cell phone circuitry may perform erratically for any number of
reasons. An out-of-tolerance component may have escaped the
manufacturer's detection, resulting in a defective unit--which may not
be evident during initial use but over time can degrade in
performance. Extreme temperature, physical or electrical shock,
airborne particulate, and ambient moisture can all induce circuit
board cracks or shorts--which may not be noticeable until the feature
in question fails or performs poorly. Finally, the battery might be
providing unsuitable power/current for the circuit.

A faulty battery is the most probable explanation for the random
degradations you have described. It would appear that the initial
distortion was the result of a weak battery. The RAM in which your
recordings were stored was probably never compromised. During the
weeks which followed your original observation, it is likely you
recharged the battery. It is therefore reasonable to attribute the 
performance improvement to the enhancement made to the circuit (i.e.,
the battery charge). To test this hypothesis, observe the
record-playback feature under various power conditions: connected to
charger, standalone, at battery level high, at battery level low, and
(ideally) replace the battery.
Subject: Re: Cell phone voice record remote voice alteration
From: godie-ga on 26 Oct 2006 04:21 PDT
If you believed in conspiracy theories then audiothink-ga'a comment is
the best explation.

Basically phone uses flash memory to store audio in your phone. This
type of memory is made from chips that can store data even without
power consistently supplied to them, technically called "static random
access memory" (see:
However these types of chips consume much power compared to ordinary
SDRAMs like the ones used by your PC. The more data stored to your
phone, the more power it will require. You should also check the
processes running on your phone, applications such as schedulers,
browsers, bluetooth activity, etc can consume a lot of processing
power which in turn translate into lots of memory access.
Depending on the ammount of power available left the phone during
playback, it may opt in to use low quality sampling rate. This doesn't
just happens with audio recordings, it also applies to Video and
Images. You can try a simple experiment by taking pictures (especially
moving objects) at different battery levels or number of processes
You will find that your phone takes better pictures when its fully
charged or the phone processor is idling.

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