Can I put a sim card in the unlocked IPhone 6s
I'm thinking about buying an iPhone 6s, can I put a sim card in it when I buy the unlocked version ?
Yes you can. That would be the only way to be able to use it as a phone, is if you insert a SIM to be able to activate it with a carrier. You also need a SIM to be able to initially activate the device.
Yes, you can. Only locked phones need to be unlocked for swapping sim cards. It can be done either through network provider or third party unlocker. To unlock, I suggest you can approach Mobileunlocksolutions.com and specify the country,locked network of iPhone 6S.Based on the availability you can get the permanent unlock service along with free instructions.