Twitter user Martin Hecko says that he's received confirmation from AT&T that SMS and data service are down in San Francisco and that things will take between 24 and 48 hours to fix. Yikes! Have any of you experienced anything beyond the usual troubles with the either data or SMS today? [Martin Hecko via lkahney]

Update: Our source at AT&T tells us that GSM and EDGE are both running fine, and that the outage was caused by a hardware issue that is rapidly being fixed:

AT&T has fixed the hardware issue and data services are quickly returning to normal. Speeds should be back to normal within about a half hour.