Does the iPhone 2G use both Wi-Fi & cell tower triangulation for location?

For the iPhone 2G (1st generation), does it use both Wi-Fi triangulation and cell tower triangulation to determine its location? Or does it only rely on Wi-Fi?

Can it still figure out its location if there are no Wi-Fi spots around? In other words, can it simply use cell towers (as opposed to my assumption that it requires a combination of both)? I'm asking because I suspect some of my camera roll photos aren't being geotagged when I'm in poor cell coverage areas where I think voice still works but data is virtually null (and with no Wi-Fi).

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