Can i just dropp a sim card in a new iPhone 5s i buy? And just start using it?

Can i just dropp a sim card in a new iPhone 5s i buy? And just start using it?

Added (1). I want to get a iPhone 5s and i heard you can just drop a sim card in and use it. I don't think i have the right sim card, so can you tell me if you can and what sim card iPhone 5s uses?

Yep… But you have to buy the phone for full price

It's not what the 5s 'uses' it's what the 5s is programmed and locked to 'use'. Example, you buy a Verizon 5s. You pop in a Tmobile sim card. Ain't going to work. Why? Carriers lock (program) their phones to work on their stuff period--not anybody else's. So buy a very pricey unlocked version or only buy one that works on the network you want. Best luck.

You need to have a cellular plan from a carrier on the SIM card if you don't already and the iPhone needs to be either CDMA or GSM and the SIM card needs to correspond