Spanish phrase
Llámame si no ~.
Meaning
Give me a call if you don't ___.
When to use it
Asks for a phone call if a plan fails. Polite though still direct, common among friends and coworkers to confirm arrival or contact.
Example dialogue
Llámame si no llegas.
Give me a call if you don't arrive.
Vale, te llamaré si no llego.
Okay, I'll give you a call if I don't arrive.