This is the 814th most frequent Italian word.
telefono
Telephone.
In this sentence, 'telefono' is used as a noun to refer specifically to a mobile phone, which is a common lexical interpretation of the word in modern Italian.
Ho dimenticato il mio telefono a casa.
I forgot my phone at home.
Here, 'telefono' represents the household phone or landline, and the usage indicates the device emitting a ringing sound.
Il telefono squillava insistentemente.
The phone was ringing insistently.
This usage implies a smartphone, highlighting its role as a platform for digital applications.