I had this on my Orange GSII. I used it all the time and it was great as I had pretty poor reception at home.
I've now got a One X on Orange and was very disappointed to find that the app wasn't included, and a bit surprised that it was a hardware limitation. Is this true?
My One X does seem to deal with the poor reception better than the GSII, but I still miss the app.
Someone had done a little work on porting it to non-Orange roms: