How to unlock a iPhone 6 plus with a lycamobile sim for free?

I have a iPhone 6 plus and I stopped using it so I told apple to lock it. Now I need it again and it is not allowing me to use a sim. It keeps saying no service. I can access all the apps and such but i can't make calls and use cellular data. I understand that i might have to pay, but is there any other way to unlock my phone for free?

You can ask Apple to unlock the phone. If they refuse, you've to go third-party. If you need help with getting your iPhone 6+ factory unlocked, mail me for more info.