Iphone5s spring for 450$ will work outside USA?

Currently i live at the US but i travel much to europe, i wanted to buy a new phone.
While i was shopping on ebay i came across an iphone 5s (spring) for 450$ , So i was wondering if i bought it will it work outside USA? Do i need to buy something for it to work? Will it work at every country worldwide?

Yes, it can work but there's a catch. For the price, I'm betting it's still locked to Sprint's CDMA network. Most of the rest of the world uses GSM signals which this phone can do but it'll have to be unlocked from Sprint for that to happen or inserting a sim won't matter because the phone will see it as invalid. You could try Sprint as they only unlock for int'l use only--no domestic US usage by a rival. But being the non-original owner I doubt it. You'll have to get it unlocked via software download. Typically runs $20-25 USD but no guarantees on success rate. Best luck.

Better make sure its not locked and that its not locked to previous owner also.

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