About the SimCard locking

so i really don't know if i am in the right sub, but let's hope so

so i bought the S5 from germany about 3 days ago, when i returned back to my country, i noticed that the phone ONLY accepts european simcards so i am locked out of using the phone for calling or texting or anything

so i searched alot and found an app which required rooting
and i found some website which will provide codes to unlock

so i am really lost here, what should i do?!

[HELP] LG FLEX 2 H959 5.1.1 Simcard Not Detected After Factory Reset

Hi please help me, my g flex 2 accidentaly wont read any simcard anymore,
it happend after i factory reset my phone,
i reseted my phone, start it up until finish,then turn my phone off
then i took my simcard off,, turn it on without simcard, turn airplane mode on, then turn my wifi on.
after a while, i tried to put my simcad again, but it wont detect.

i tried to factory reset again for few times but it wont help,

anyone ever have same issues?
how to solve it?pleaseeee