Is SIM unlock permanent?

[nasty007]

Hello

I have bought Droid 3 from ebay, phone was SIM unlocked.
I use phone on GSM network in Croatia and everything is working great, i have no issues whatsoever.
My system version is 5.6.890
My question is if i flash some custom ROM that have higher system version or ICS ROM will i lose my SIM unlock?
I cannot afford to lose it because i don't have unlock code and from Croatia i cannot get one.
I would like to test some ROMs but im not sure so i hope to get answer here.

Thanks in advance

 

[Doubleyoupee]

Yes.
You can flash ROMs without losing SIM unlock
Mine is unlocked (europe) and I've successfully flashed some ROMs. Currently using mavrom 3.0 (newest system version) and I've tested ICS too.

 

[nasty007]

Thanks for your answer