The way in which most Spanish speakers ask their friends for the phone number is:
- B. ¿Cuál es tu número de teléfono?
Informal requests.
In Spanish, a big difference is made between a formal request and an informal one depending on the pronoun or possessive adjectives used, personal pronouns like "tú," or "vosotros" are considered informal and only used with friends and family, while others like "usted" or "ustedes" are considered formal and are used to refer to people who require our respect.
On the other hand, possessive adjectives also show whether a sentence is formal or informal, in informal sentences "tu / tus" is used, while in formal sentences "su / sus." Since the question is aimed at a friend, the one containing the informal possessive adjective "tu" is used.
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