Question:
Is it permissible to conduct a nikah or pronounce a divorce over the phone?
Answer: حامدا ومصليا ومسلما
Nikah is not valid over the phone.
However, a divorce pronounced over the phone will occur.
And Allah Ta’aalaa knows best
(Hazrat Mufti) Ahmed Khanpuri (May Allah preserve him)
Mahmoodul Fataawaa (5/310)