The number is (650) 446-6777. Just text the word METAR or TAF followed by the ICAO airport identifier of interest and youll quickly get a reply with the requested information. Even international airports are available. If you want to get hourly updates, you can subscribe (for free) by putting SUB first in your text message. Thus, to get hourly METARS, for instance, for Walla Walla, WA, (KALW) youd text SUB METAR KALW until you no longer wanted them and sent STOP METAR KALW.