I have a bunch of Uniden DSS9755 cordless phones and an answering machine / base station. These are quite a few years old now, but after replacing some batteries they're still working quite well overall. I would however like to replace the kitchen unit which has had a bit of a hard life. 

My question is will a modern Uniden (or other) DECT phone still be compatible and register with the rest of the system?  I don't really want to have to replace the whole lot if I don't need to.

Having said that, I see there is a system on the market that apparently lets you join your mobile phone into the home system as well. Does anyone have any experience with these?

Thanks,

Pete.