This is definitely NOT a RJ11 to BT converter. Just because you will be able to plug your phone in the mains, it doesn't mean that it's going to work as well. And the simple thing is that the wiring inside of it is completely wrong... I would have return it, if brought by a local store, but I didn't thought it worth the trouble trough mail. So I opened it and found out what I was suspecting; 1,2,3,4,5,6 in RJ were 1,2,3,4,5,6 in BT where they should have been 1,3,2,5,4,6.