If I reset my unlocked iPhone 5s to factory settings, will it be locked again?

I'm looking to reset my iPhone 5s to factory settings to sell, but I'm unsure of wether this will lock the phone again?

I paid to get the phone unlocked from EE, so would this lock the phone again?

As you had it unlocked properly by using a carrier then a factory reset won't lock it again.

If it was done properly by the manufacture or carrier then there's no problem. If you did it yourself illegally then it would become carrier locked again.

I do not know who EE is so I can yes that you used a third-party service who did it illegally. Therefore yes it would lock your phone up

It's a permanent unlock so your phone will never get locked back again even if you reset or update the iOS.

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