None of the 3rd-party SMS app is allowed to send messages with more than 140 characters (approximate number, carrier/country dependent), if the app is not defaulted messaging service provider, because Google has changed messaging service/API permission for non-default message app.Thatâs to say, the message sent via non-default SMS App will be split evenly automatically by Android System with version 4.4 +, if it exceeds the 140 character. And AirDroid SMS feature, as you might understand, can still not be defaulted as SMS App.