Return: My Phone Number

This adds back the option to set the device phone number,
just for fun probably. ;)

Credits : CM

PS 2 : Cleanup

Change-Id: Iefab49ae7881cdd9a5335553938bf29cae63c67c
White emergency dialer

Change-Id: I3c4e54d1e6a5f008bac1d32314ca53ec33ed2277
Return: National Data Roaming [2/3]

Credits: CM

PS 2 : Fixed Deprecated onPreferenceTreeClick
PS 3 : Trim lines length
PS 4 : Fix FC

Change-Id: I1230c8e227e787f51bea0ae3756892ab4f6e5144
rework preferredNetworkMode's