Is it permissible for the one performing tawaf to use the phone or talk about worldly matters?

Question:
What is the ruling on using a mobile phone by the one performing tawaf around the Ka'bah, and also talking about worldly matters, which sometimes may extend to joking?

Answer:
It is permissible to talk during tawaf, especially out of necessity, and greeting the person next to you is permissible. Talking out of necessity is permissible, but talking without necessity is not recommended. It does not invalidate the tawaf, but it is not recommended because it distracts you from the remembrance of Allah and from focusing on the worship.