After successfully launched and sold in European market, the SIM-free iPhone 6 and iPhone 6 Plus are now available in US. If you will not like to go for carrier offers and subsides, it will cost you $650 for 16 GB iPhone 6 and for iPhone 6 Plus it starts at $750.The more storage capacity you like to have in your handset, the more you have to pay. For every bump it is $100. For 128 GB iPhone 6 it makes up to $850 and the iPhone 6 Plus with the same storage is $950.