The Sony Ericsson Xperia X10 is a high-end smartphone in the Xperia series designed by Sony Ericsson. There are two versions of the Xperia, denoted by the a and I suffixes, which prompted many users to ask what actual differences between the two is: the answer is just the frequency bands for 3G.
The Xperia X10 is only one phone with two different versions, and Xperia X10 is used mostly in Europe and Asia. X10i is the newer version of the phone.
Sometimes, electronic and technology companies seem to want to create and produce different kinds of the same product. This is done because one area of the world uses one product and another region of the world uses the other product. It is not known why this happens, but it does.
For example, the Sony Ericsson Xperia X10 was produced for certain phones it supports a certain type of frequency band and the Xperia X10i supports different frequency bands. Also, the Xperia X10 is the phone that is used more often in the United States and South American countries like Brazil, Argentina and Chile. However, the Xperia X10i is often used in European and Asian countries like England, France, China, and Japan.