One more concrete example on the Galaxy S4 from Verizon, they preloaded a 3rd SMS app and made it the default. It worked similar to Hangouts or other messaging

One more concrete example on the Galaxy S4 from Verizon, they preloaded a 3rd SMS app and made it the default. It worked similar to Hangouts or other messaging apps in that it would send non-sms messages to other Verizon Messages users and via SMS to other numbers. The kicker? They charge for those messages like SMS messages.