Globally LTE deployments going on in the fastest way and the new trend is LTE2100 (FDD). The trend is something major that GSA, the Global mobile Suppliers Association, published its first status report about the development of LTE in 2.1 GHz, known as 3GPP band 1.
Common deployment trend at present:
LTE FDD : 1800, 800, 2600 and 2100 MHz
LTE TDD : 2300, 3500 MHz
The reason behind the interest in LTE2100: