Long text

[Jimslade]

Hi there guys firstly many thanks for looking at my question today. I have a xperia xz and I want to send long texts. I don't want to use mms as it costs but I was sending long texts for years even on my old sony z1 Is there a way to tweek the phone to do it or do I need a third party app. I have used them in the past but I have to let them access everything except my medical records then its full of adverts, is there a way i can alter settings to send long texts. Please help.. Jim