Hi, I am moving out of the country to study abroad for a year. I was going to sell my Verizon GS4 and buy another GS4 that is GSM but people told me I would be better off just carrier unlocking. I have searched around the internet and it just seems to send me to a lot of articles where you have to pay some company to give you an unlock key. To me, this looks like a scam. Does anyone know of any alternatives and if not, have recommendations of good legitimate unlock companies? Also, I will be traveling to many different countries also. Do I have to carrier unlock to each individua SIM card?