Internet only works when phone off the hook??

[Jango]

At the moment, whenever I put my phone off its hook, the internet works and whenever my phone is on the hook, my internet disconnects...

Why is this happening? (To post this thread my phone had to be off the hook...)

 

[Jango]

Is a microfilter one of those small box things, which lets you plug a modem and a phone into a single phone socket? Because I had one, but had to replace it with a normal splitter as it broke.

If not, what is a microfilter and where can I get one?

I don't have SKY or anything, just my phone and modem plugged into my phone socket.

My modem is a Netgear DG834GT.

 

[Jango]

Ok, thank you everyone for your help. I will get a new microfilter as soon as I can!