Spanish phrase
Avísame por ~.
Meaning
Let me know by ___.
When to use it
Requests being informed by a specified method. Used for arrivals or urgent or time-sensitive matters; commonly specifies phone, text, or email.
Example dialogue
Avísame por teléfono cuando llegues.
Let me know by phone when you arrive.
Claro, te llamo al llegar.
Sure, I'll call you when I arrive.