Rename install_first_time variable and file name. Remove the install/upgrade_switch.php which isn't being used anymore. Update the indentation and remove inconsistent white spaces.

app/dialplan_outbound/dialplan_outbound_add.php

@@ -207,7 +207,7 @@ else {
 						$label = $text['label-11d'];
 						$abbrv = "11d";
 						break;
-					case "^(?:\+1|1)?([2-9]\d\d[2-9]\d{6})$":
+					case "^(?:\+?1)?(\d{10})$":
 						$label = $text['label-north-america'];
 						$abbrv = "10-11d";
 						break;