Will my iphone be sim free again after reset?

I have a iphone 4 when i got it from my brother it was not sim free then i came home from traveling to switzerland and i paid to get it sim free now it works on all sim cards, my question is if i reset all the setting of the iphone will it be sim free or will it lock to the old switzerland network again so i will have to pay for it to be sim free again?

No your phone is permanently SIM free because the identification of your phone was very with Apple so when you connect with iTunes the will unlock it with out you noticing

NO LO LEAS LO HICE PARA SALVARME
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Really depend on how you unlock it. If its a Factory Unlock using the Imei number then you can restore and update as much as you like and it will still be unlock. If you are using gevey sim or a jailbreak unlock the it will become lock when you restore it.