Define the new defaults.

Sources:
https://mixpanel.com/trends/#report/iphone_6/from_date:-157,report_unit:month,to_date:0
https://mixpanel.com/trends/#report/iphone_models
https://mixpanel.com/trends/#report/ipad_models
https://mixpanel.com/trends/#report/top_tablets
https://mixpanel.com/trends/#report/android_manufacturer
https://en.wikipedia.org/wiki/List_of_iOS_devices#iPad
Other

apple-iphone-5/device.json

@@ -1,5 +1,5 @@
 {
-  "show-by-default": false, 
+  "show-by-default": true, 
   "modes": [], 
 
   "//" : "iPhone 5, iPhone 5S, iPhone 5c have identical display & screen characteristics",

apple-iphone-6-plus/device.json

@@ -1,5 +1,5 @@
 {
-  "show-by-default": false, 
+  "show-by-default": true, 
   "modes": [], 
   "title": "Apple iPhone 6 Plus", 
   "screen": {

apple-iphone-6/device.json

@@ -1,5 +1,5 @@
 {
-  "show-by-default": false, 
+  "show-by-default": true, 
   "modes": [], 
   "title": "Apple iPhone 6", 
   "screen": {

google-nexus-7-2/device.json

@@ -1,5 +1,5 @@
 {
-  "show-by-default": false, 
+  "show-by-default": true, 
   "modes": [], 
   "title": "Google Nexus 7", 
   "screen": {

notebook-with-touch/device.json

@@ -1,5 +1,5 @@
 {
-  "show-by-default": false, 
+  "show-by-default": true, 
   "modes": [], 
   "title": "Notebook with touch", 
   "screen": {

samsung-galaxy-note-3/device.json

@@ -1,5 +1,5 @@
 {
-  "show-by-default": false, 
+  "show-by-default": true, 
   "modes": [], 
   "title": "Samsung Galaxy Note 3", 
   "screen": {

samsung-galaxy-s4/device.json

@@ -1,5 +1,5 @@
 {
-  "show-by-default": false, 
+  "show-by-default": true, 
   "modes": [], 
   "title": "Samsung Galaxy S4", 
   "screen": {