Answer:
(Fatwa: 880/546/H=1433)
If you are sure that the owners of those mobiles never come again then you should sell them as per market price and keep your service charge and give the remaining amount to poor and needy ones. Whether you give slip or not the ruling is same in both the cases. However, it is better to write complete address and contact no of the owners and in case they do not come you should contact them and take in your possession after their permission.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
