Italian to English Law/Patents General / Conversation / Greetings / Letters Letter requesting information for legal case

This phrase is found in a letter from an Italian Police office requesting information to a phone manufacturer regarding a mobile phone. The previous paragraph has requested the personal details on the owner of a handset that has been found abandoned, and provides the model number and details of the phone for identification. The final paragraph sets out email addresses to reply to.

The context of this term is:

"Di seguito vi forniamo il numero di telefono cellulare XXXX su cui trasmettere eventuali codici/password."

I am confused because I cannot figure out whether the telephone number is being provided for contact reasons "on which to send potential codes/passwords" or whether the use of "su cui" is implying that this is the telephone number of the abandoned phone.