Can I record from a mobile phone's PHF socket?

Is it possible to record from a mobile handset's socket where the personal handsfree would normally plug in?
I use a Nokia 8310 handset with Nokia HDC-5 handsfree (3.5mm jack):
http://pinouts.ru/data/nokia_headset_pinout.shtml
But sticking a jack plug in the phone might cut off the mic/earpiece on the handset even if the jack was not actually wired to a handsfree. Has anyone tried this?
ALTERNATIVELY... can I take a feed from the handsfree wires and record from that? Has anyone done this?
Where on the handsfree is it best to take a feed: at the plug or at the earpiece?
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Well just get a socket doubler from Maplin and use the headset.
http://www.maplin.co.uk/Module.aspx?ModuleNo 14&criteria=Jack%20Adaptors&doym5
1.49p - record in stereo for mic / earpiece.

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Hi Mark, I guess you didn't check my link. It shows the plug is a 4-pole jack.
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3.5mm jack has a meaning of its own, and on many phones that take a 2.5 or 3.5mm jack plug (e.g. all my timeports, some Mitsubishi, BT Converse phones), the socket is just a stereo one wired with mic, earpiece & ground. El cheapo headsets are very common and standard jack connectors, extension cables etc. work just fine.
OTOH Maplin do sell the plug and socket at any rate and you could lash up the rest of it yourself
Plug http://www.maplin.co.uk/Module.aspx?C=SEO&U=SiteMapByDept&ModuleNo )686
Socket http://www.maplin.co.uk/Module.aspx?ModuleNoD053&criteria=4&doy m5
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R. Mark Clayton wrote:

The original link provided by the OP mentions 2.5mm, not 3.5mm
Secondly, it shows it has 4 conductors (Speaker+, Mic+, Speaker-, Mic-). As they hare separate grounds, you cannot get by with just a stereo 2.5mm plug.
I've seen 4 conductor 3.5mm plugs in Maplin, but never 2.5mm versions. For these, I'd just buy a cheap 2.5mm 4 conductor handsfree kit and cut the wires (leaving plenty of cable from plug to end) and wire it into the cable.
D
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My mistake. It is 2.5mm and not 3.5mm. However think I need a plug and also a socket then I can connect the two in a way such that I can plug in any PHF and the recording feed comes from the connection between the socket and the plug going into the handset.
PHF ------> >-----|-----> >------handset | | | feed to recorder
As you say, getting the plug is easy but I will have to try a specialist dealer for the socket although it might still be a long search.
ALternatively it be best to take a recording feed from near the earpiece of the PHF if there is enough side tone present to hear both side of the conversation.
I wonder if anyone has any experience of trying this.
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Hi Mark, thank you very much for checking out the parts at Maplin. From the diagram I still think I will need four positives plus their screening.
http://pinouts.ru/data/nokia_headset_pinout.shtml shows a mic-, mic+, ear- and ear+ and (a call disconnect short).
If Nokia have what is effectively a two connection PHF then I guess they would not use a 4-way jack plug.
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This is probably not the answer you are looking for but many phones can record conversations through the built in sound recorder on the phone.
However, I'm sure its possible, like most things but I lack the intelligence and know-how to answer!
Dan
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