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[burakkucat]

. . . (the faceplate is - i think - a mk2 with the RJ11 on top)

Just for clarity (for future readers of this thread), I'll mention that the upper socket is designed to accept an RJ45 plug but it can also take an RJ11/12 plug.

[plexy]

^ seconded. Its got the RJ45 pins but BT tend to supply it with an RJ11 wire

This has caused a lot of confusion in the past as some commenters have assumed that because the RJ11 wire 'fits' it *must* be an RJ11 socket. But thats not the case, its RJ45 which will take an RJ11 as well (I understand the reason for this is to easily accommodate both home and office uses, where the latter normally has an RJ45 patch panel for distribution from the demarc.

Generally home users will identify it as RJ11 due to the wire. The definitive answer is as above from burakkucat. And for posterity, heres a handy picture showing way more than 4 pins in that top socket.