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.
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.