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In the following sentence, "ti lascio" is conjugated at the indicativo presente :
Caso mai tu volessi chiamarmi, ti lascio il mio numero.
Should we understand
In case you want to call me, I let you my phone number. (now)
or
In case you want to call me, I will let you my phone number. (later, if you ask for it)
... ?
Does indicativo presente often has the value of a future tense, as would be expressed by a future tense in other languages ?
The sentence quoted (Caso mai tu volessi chiamarmi, ti lascio il mio numero) can only be understood as Person #1 (the speaker) giving Person #2 (the listener) their phone number now, in case #2 wants, in some future time, to call #1. If the other sense were meant, one could say:
Caso mai tu volessi chiamarmi, ti darò il mio numero.
or something like it (but it would be a little strange: we should contrive a situation where #2 can contact #1, but not by phone, to get their number).
As to the last question, perhaps it deserves a separate question. The short answer is that indeed, in some cases, especially in informal speech, one uses present to mean future; for instance: Se domani piove, non facciamo la gita.
