Massallah regarding one talaaq

Asalaamu Alaiykum. Dear Moulana. Could you please guide me on the following matter. I was married for a few months when my husband left me. After leaving he gave one talaaq telephonically. I have not been in contact with him since then (almost 2 years). But he has not given me my talaq papers as yet. Is my talaq valid? Can I make nikah with someone else?
Jazakallah.