They certainly should have let you know, although it is mentioned on their web site.
As their price is so much lower than their competitors, (£7.99/month), I don`t think you can complain too much as it is still good value.
Xiaomi Mi Mix 2 review
What went wrong at the Designs of the Year 2017
iPhone X news: Release date, price, new features & specs
Comment utiliser Live Photos ?