Interesting, I just heard an interview [1] with Marty Cooper (inventor of the cell phone) who is working on a simplified phone for seniors called the Jitterbug.

Interesting, I just heard an interview [1] with Marty Cooper (inventor of the cell phone) who is working on a simplified phone for seniors called the Jitterbug. He mentioned that the phone has a dial tone to indicate that the phone has signal. [1] http://hereandnow.wbur.org/2013/04/09/cell-phone-inventor http://hereandnow.wbur.org/2013/04/09/cell-phone-inventor