Anecdotally, I woke up to no signal / “SOS” mode on my iPhone this morning at around 0600 and had service restored around 0830 in South Carolina. However, a coworker in Memphis confirmed he was still out of service at 1000 so it’s regional restoration.
I always wonder instead of a regional restoration, if they would “disable” segments of SIMs/accounts randomly to avoid lightning strike (it’s not a DDoS…) their network as they turn things back on. Depends on what the recovery method is, but could be problematic to turn everything back on at once.