I can use my cell but not the internet.
At&t worked fine all the way up and down
As expected, Network connectivity varies with carrier, quality of moble device and location and variances are exacerbated in this mountainous environ... even sketchy at times. There are also several State Park posts with land lines, including at the visitor center at the summit. Mt. Diablo is an incredible gem of a State Park, take time to enjoy the natural beauty.
Mobile network was spotty at best. I wouldnt rely on getting a signal and appreciate good fortune having a signal
Probably, i usyally have cell access with ATT
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