In some parts of the world, mobile phones are sold with a built-in SIM. Thus, a particular network carrier would be attached to these mobiles. The plans for calls, data, and monthly charges would be such that the cost of the phone and its usage would be paid by the customer in monthly installments. Most plans for such locked phones would be postpaid; therefore, there would be a lot of documentation and commitment to the particular network provider that would be involved while taking the connection and buying the phone.

There are heavy penalties if the connection is terminated to get back the cost of the phone. Similarly, it would not be possible to switch to any other network in the midst of an ongoing long-term plan.

Therefore, most of the people would prefer sim-free mobile phones. These phones would be unlocked, and the user would be free to use any sim card of his/her choice on the phone. The user can choose a prepaid or postpaid plan according to his/her convenience. Similarly, switching to some other network carrier and using two different sim cards from two different carriers through dual sim phone would be easily possible with this option.

• iPhone 8 64 GB
  This phone is one of the most admired sim-free options owing to the quality of graphics, features and looks. Owning the latest model of iPhone, there has been a status symbol around the world for many years now. The specifications include a hexa-core Apple A11 Bionic processor, 2 GB RAM, 64 GB internal storage, dual camera with a 12-megapixel primary and 7-megapixel secondary camera in the front for selfies.
• Moto G5 Plus
  This is part of another excellent range of sim-free mobile phones made by Motorola. This comes with a 5.2-inch display, 32 GB internal storage, the best 12-megapixel camera, and attractive colors such as golden and lunar grey. It comes with connectivity options such as GSM, 3G, and 4G LTE. This phone operates on the Android 7.0 Nougat system and would provide an ultimate smartphone experience at affordable price.
• Sony Xperia XA 1
  This is another exciting sim-free mobile phone made by a leading name in the electronics industry. This phone has a 5-inch display, octa-core processor for faster processing speed, 8-megapixel front camera, 3 GB RAM, Android 7 operating system, 32 GB internal storage, and a 23-megapixel rear camera.

Thus, wide varieties of sim-free mobile phones are available from various brands and different configurations. Aspirant buyers can choose the one that suits their requirements and budget and the appearance that appeals them the most.