following message via his cell phone: 'You were rude to me so I am giving you a divorce.'

If it is confirmed that your husband sent you the message via the cell phone, then that constitutes one Talaaq-e-Raj’ee (revocable divorce).

He may verbally revoke the divorce by saying, ‘I take you back as wife’ or by being intimate with you.

and Allah Ta'ala Knows Best

Mufti Ebrahim Desai