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Travelling to Irving, CA ffrom the S.F. Bay Area

Traveling along US 101 from Paso Robles to Irvine, I've only experienced a break in 4G coverage from just south of Santa Maria to Goleta, which is just before Santa Barbara.

However, I still had 1x coverage during that time.

Use the Sensorly app. I myself mapped pretty much everything from Paso Robles to Ventura, so that will be reliable, at least.
 
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