When I bought my Pre3 from some guy in Norway in 2012, it came with a touchstone. But it didn't work.
Well, just after Christmas, I thought I'd give it another try. I ordered a touchstone from China (before I saw the post here about the boxload of touchstones). It just got here. Apparently, someone put it on the slow boat.
Anyways, this one works perfectly. The phone sticks properly and starts charging immediately. I love it!
On a sidenote, my Grandstream HT502 VOIP box got here last Friday, and my rotary phone works on VOIP now. My whole life is going retro....