The SIM-free iPhone is revealed, so it does not tie you to a service provider or multi-year service provider agreements, providing you more independence to choose a plan. But the real distinction between SIM-free and contract-free iPhones seems to be the system groups reinforced.
The SIM-free iPhone 6S provides the design no. A1633, and the bigger iPhone 6S Plus is A1634.
According to Apple’s website, this design is best for AT&T and all the other more compact providers like Cricket or US Cellular, because it facilitates their LTE systems.
The other edition available worldwide — and the design you will get with Dash, T-Mobile and Verizon — is the A1688 for the iPhone 6S and A1687 for the iPhone 6S Plus.
This design is detailed to back up the LTE systems in nations such as North America, the U.K., Italy, Malaysia, Hong Kong, Asia, Singapore, and Sydney.
In Chinese suppliers, you’ll want the third edition — A1700 for the iPhone 6S and A1699 for the iPhone 6S Plus, which facilitates the nation’s three big providers Chinese suppliers Cellular, Chinese suppliers Telecommunications and Chinese suppliers Unicom.
With the iPhone 5S and iPhone 6, The apple company began moving out SIM-free designs several weeks after preliminary revenue began. Now, it’s only been two several weeks since the iPhone 6S became available.