Determine mobile connection more accurately.

Fixes: 136978263
Test: atest PreProvisioningControllerTest
Change-Id: I0b53a53a170b033872cdabea1c0887da03282abb
Merged-In: I0b53a53a170b033872cdabea1c0887da03282abb
(cherry picked from commit f657b6a15fb6baa1755c9dd88abf45981e15d209)
3 files changed