What should i look for in unlocked iphone 5s?

I recently broke my galaxy and decided to get the 5s.
The problem is i use a carrier called H2o and it isn't big like att, sprint, etc.
Does every 5s have a sim?
If i order a 5s from ebay saying its unlocked, would i be able to use it right away if i insert my h2o sim card?

Call your cell phone and ask them that question

You'll need a factory unlocked iPhone 5S to work on H2O wireless, it's a GSM carrier. H2O provides SIM card, put the SIM in the phone and you're done. If you need iPhone 5S factory unlocked cheaper than retail, mail me.

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