As far as the latest mobile phones are concerned, the company that manufactures them and the company that provides connectivity are two different entities and concepts. A sim-free mobile phone is an unlocked phone that doesn’t carry any SIM card in it. The user would have the freedom to select any network carrier and insert the sim in the mobile to activate the number for making and receiving calls, sending and receiving messages, and using data for internet connectivity according to available spectra such as GSM, 2G, 3G, and 4G.

Almost every mobile phone manufacturer would make sim-free phones in most of the parts of the world. There are some countries where there is a huge market for locked phones; however, due to the convenience of choice and operation; most of the users are switching to sim free mobile phones.

• Wileyfox Spark Dual Sim Mobile
  This sim free mobile phone comes with a 5-inch display, 8 GB internal memory that is expandable to 32 GB, 1 GB RAM, 8-megapixel primary and front camera, MediaTek 6735 processor, dual-sim functionality, and 4G connectivity.
• Lenovo Z2 Plus
  It is one of the smarter looking smartphones due to its top-class appearance. This phone comes with 2.15 GHz processor, 64 GB internal storage, 4 GB RAM, Android version 6.0.1 operating system, 5-inch LTPS LCD touchscreen with 441 PPI pixel density and excellent resolution, 13-megapixel rear camera with auto-focus, dual sim functionality, and connectivity for GSM, 3G, and 4G LTE.
• Redmi 4 (Black 64 GB)
  It is another fascinating smartphone with fantastic looks and excellent features at an affordable price. This smartphone has a 5-inch display with amazing resolution and a 13-megapixel primary camera for HD photos and video recording. This phone is powered by Android version 6.0.1 operating system for compatibility with most of the latest apps and games, a lithium-ion battery with 4100 mAh capability, long standby backup, a high-speed processor, and 4 GB RAM.
• Samsung Galaxy Note Edge
  This phone is also a great-looking mobile that is made by Samsung. It has a 5.6-inch display with amazing clarity and best-in-its-class resolution for better graphics view. It operates on the Android KitKat version 4.4 operating system, which is compatible with the latest mobile apps and high-quality games. It also has a 2.7 GHz quad-core processor for excellent processing speed that would be sufficient for various operations, 32 GB internal storage that would enable the user to save favorite video songs, movie clips, photos, and the phone can be converted into a treasure of beautiful songs and videos.

Thus, there are many options for sim-free mobiles. This is ideal for the users that wish to pay for the phone upfront and save on monthly charges that would be according to the usage of data and calls.