HEllo @Kanika
Thank you for your question.
Our lost property service, enables you to report forgotten or lost objects via the Internet, telephone or at the ticket counter. We link the found items with the lost items and you will receive an SMS, an e-mail or a letter which will inform you about the status of the search after four/five days and another one after ten days.
More information may be found on: www.sbb.ch/en/station-services/services/lost-property-service.html
I wish you all the best for your phone.
Kind regards
GiorgiaB