In germany unlimited sms has only been a thing since ip based messengers like WhatsApp took over messaging and nobody is using SMS anymore, before that SMS were quite expensive after you hit the budget of your contract (typically about 50-100 SMS). Now, unlimited SMS is the norm and things like this browser get interesting. But even if it would be a great working alternative, it will only work until carriers adapt. I really want unlimited data...currently i get 750MB with a contract that costs EUR 50.