Questions & Answers about Ho il tuo numero e il tuo indirizzo.
Why does the sentence use il tuo instead of just tuo?
In Italian, possessive adjectives like tuo (your) almost always need a definite article like il (the) in front of them. Literally, you are saying "I have the your number".
Indirizzo starts with a vowel, so why do we use il instead of l'?
If a woman is speaking, does she need to change il tuo to la tua?
No, because possessive adjectives in Italian match the gender of the thing being owned, not the person speaking or listening. Since numero and indirizzo are both masculine nouns, you use the masculine il tuo no matter who is involved.