Our Noble Sheikh Saalih AlFawzaan-hafidhahulaah- was asked:
Question Number 448: What is the ruling of young men speaking to young women by way of telephone during fasting? and how about if their ones in the process of marriage?
Answer: Conversating between young men and women by way of telephone is not permissible , due to that which is in it from trial, except if the young women is one that is in the marriage proccess with the one who is speaking to her, and the conversation is for the general benefit of the proposal, but its more appropiate for him to speak to her guardian, as for conversations between youth in other than circumstances of marriage, then this is impermissible due to that which is in it from extreme fitnah and the fear of falling into to that which is impermissible, and if this is in the time in which one is fasting then this will affect the siyaam by decreasement, for that which is requested is preserving and protecting ones siyaam from those things that can bring decreasement to it. And how many times has these telephone conversations ended in immoral disasters and social crime, that which is incumbent upon the guardians of young women is preventing and monitoring them from this danger.
AlMuntaqaa page 365
(Abu Shu’ayb As-Somaalee)