How to Say "phone number" in Spanish
The Spanish word for “phone number” is “teléfono” — A1 level. This is a very common word in everyday Spanish.

Examples
¿Me prestas tu teléfono para hacer una llamada?
Can I borrow your phone to make a call?
El teléfono está sonando, ¿puedes contestar?
The phone is ringing, can you answer it?
Olvidé mi teléfono en casa esta mañana.
I forgot my phone at home this morning.
Always Masculine: 'el teléfono'
Even though it ends in 'o', it's good to remember that 'teléfono' is always a masculine word. So, you'll always say 'el teléfono' (the phone) or 'un teléfono' (a phone).
Device vs. Action
Mistake: “Yo teléfono a mi amigo.”
Correction: Yo llamo por teléfono a mi amigo. 'Teléfono' is the thing (a noun), not the action (a verb). The action of calling is 'llamar' or 'telefonear'.
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