We've stopped using pagers altogether as they didn't have the range we needed. Everybody has a cell phone; that's what we use now.

We've also tried pagers, but not the text kind.  Years ago we used simple digital pagers, but people kept forgetting to return them or not hearing them go off and were ineffective.  More recently we tried restaurant style pagers that flash and buzz, but ended up losing many of them as well.  We think cell phones work best.  That way the docs can call them and pass on info without having to wait for them to return to the waiting room unless it's urgent.