Quite true. On my old Verizon Motorola P8767 (a color flip phone -- it had four colors) I could enter "engineering mode" and increase the bitrate of voice call

Quite true. On my old Verizon Motorola P8767 (a color flip phone -- it had four colors) I could enter "engineering mode" and increase the bitrate of voice calls over the network. It meant you were using more than your share of the voice pipe, but at least my voice sounded excellent. Switching to a 2007 AT&T iPhone from Verizon was the equivalent of going back to two tin cans on a string. A string that a vengeful voice god would cut at random between 5 and 15 minutes every call.