Phones bought from the cellular service provider are locked to their system, so that customers are less inclined to switch service providers due to the added cost of a new cellphone. They can also opt to have the GSM phone unlocked so they can continue to use it, but this will also incur costs, not to mention void the original warranty.
Customers can buy unlocked phones from various dealers. These phones are more flexible can be used with any service provider. CTI-Miami is an online retailer and wholesaler of unlocked mobile phones. They ship anywhere in the world; users only need a SIM card of a local service provider in order to use the cellphone.
The site allows for a comprehensive features comparison between selected unlocked phones making it easier to decide what phone to purchase.
Phone brands include Nokia, Sony Ericsson, Samsung, Motorola, LG, Apple, and Blackberry. There are also various accessories available, such as batteries, cases, and memory cards. There is a section for mobile phones to be made available soon.
GSM (Global System for Mobile communications)
