Where the phone is made has nothing to do with the model.
F180S/K/L are the phones for three carriers on Korean market. In a nutshell, F180 uses the same hardware as E975. Two main differences:
1. F180 has a DVB module instead of FM Radio in E975 (with a telescopic TV antenna in the upper
left corner). This feature is useless outside of Korea, but doesn't cause any problems (just doesn't work). If you don't have this antenna on your phone, you can be sure it's not F180.
2. LTE bands are different from E975, and also different between three F180 models. Few people are reporting that LTE on F180 actually works in some countries outside of Korea, but be ready to accept the fact that you will not have LTE.
For more details, look up topics about F180 to E975 conversion and associated problems (mostly with the network signal and screwed-up IMEI). There is A LOT of info on the subject.
Optimus G F180S, Sling v2.2.2
Xperia X10 Mini, rooted stock 2.1
MeMO Pad HD 7 ME173X, rooted US stock 4.2.2
To whom it may concern: STOP nagging about pressing the freakin' Thanks button!!! It is rude, stupid, and annoying as hell. I am not an idiot who needs a huge in-my-face reminder to press it, and I will press it when I feel thankful, not because you asked for it!