Determine mobile connection more accurately.

Fixes: 136978263
Test: atest PreProvisioningControllerTest
Change-Id: I0b53a53a170b033872cdabea1c0887da03282abb
Merged-In: I0b53a53a170b033872cdabea1c0887da03282abb
(cherry picked from commit 4a6ff05edb5db4cc557c28e6a34863bf456d17e8)
3 files changed