Best answer by Mohammed
Welcome to the iD Community.
In regards to what's included and what isn't included for UK usage, we've already got a section on our website here
In regards to International texts, this depends on which country you're texting.
You'll need to go to this link and then select International, followed by the country you want to know the rates for.
You'll the be able to see what it costs for calling/texting that country etc.
Hope this answers your question.