[st_7]

Hi, I am from India & I am looking to buy an android mobile. Since I am new to these, I want to be clarified on few things, first of all I am little confused about the technology terms(3G & 4G) that are being used by many people online. As far as my knowledge goes 3G(HSPA=HSDPA+HSUPA) is related to GSM Network, in the cdma network we have EVDO technology which is capable of delivering about same speeds as 3G & 4G is nothing but LTE or Wi-max, am I right?. But many people are using 3G while refering the CDMA phones. And I want to buy Samsung epic 4G, so if i buy Samsung epic 4G(sprint) version,can i use it with any cdma network operators in India as Indian cdma network operators also operate on cdma 800 MHz band.I also read that sprint version of epic 4G doesn't use any sim cards how true is that, if it is true how can i use it with the Indian cdma network operators(who all of them use SIM cards). And is Samsung epic 4G(sprint version which is advertised to be capable of handling 4G netoworks) work only with Wi-max networks or is it also capable of working with LTE data networks also. Finally, I want to be confirmed whether the Samsung epic 4G(sprint) has 16GB inbuilt memory or it comes with 16GB memory card installed.

Sorry if this is posted in wrong section. Thanks.