"I haven't a phone, sorry" not accepted. I don't know what "'sdim" means (hint missing & reported) but it felt like the translation should be fairly colloquial.
This is another zombie sentence, sorry. We are unable to edit it.
"Sdim" is a spoken contraction of "Does dim". I'm not sure it is correct to use that contraction there since it feels like you are missing a "got" i.e "I haven't got a phone, sorry".
Think I slipped into our local dialect - but "I haven't got" should be all right. (Where I live t'mod = tha knows)