Help Identify Mystery Icon in Status Bar topic

I just received my Moto X 2014 as a replacement from Moto X1st gen and I notice a weird icon in status bar. It is the third icon from the left that looks like a teardrop in a keyhole.
I use Apex as my launcher same as old phone but never had this icon before.
Any ideas would be helpful.

Thanks

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need help identify phone topic

Got a GT-I9100 According to phone info in settings.

I vaguely remember something about a S2 galaxy plus? I think this might be one?

Would I need to look for a rom on the normal S2 i9100 android dev forum?
Or on the s2 i9100 G android forum version?

[Q] How do operators identify? topic

Hi all,

I got a general question for you regarding mobile operators.
Is there any other way than following, for mobile operators to identify a unique android cellphone:

a). SIM-card
b). IMEI-number

If any other possiblity to identify, what would this be?