In Denmark it was called text-TV and was an integrated part of every channel, own button on the remote and all. It was retired a few years ago since almost nobody used it anymore..
It's mostly just another advertising channel for premium phone numbers and bs horoscopes, phone sex lines or bs "surveys" where you txt an expensive number. All the content is autogenerated like weather, sports results or program preview.
Ukrainian one has a phone number you can text to post messages in a global chatroom for around 1cent per message
the chat is still up and full of bisexual men looking for partners for some reason
Okay what the hell is up with folks using obscure commication methods to try to fuck?
On a similare note, there was the remains of an old prototype communication system in the dorms of a nearby college that was removed back in the 70s that was restored recently and for some reason the furries at the college fixed a quarter of it and were hooking up using it.