Re: Ota and otg cable supporte and cable model
OTA is Over the Air updating. No software needed, all phones support it and your carrier does it.
OTG, On-the-go, is a way to connect USB devices to the phone. If the phone supports it, any OTG cable will work (although I prefer a 3-jack cable - one to plug in power for the external device, in case you want to use something like a USB-powered external hard drive).
The difference between a $2 (122 INR) cable and a $20 (1.220 INR) cable is the looks - the only thing that makes it an OTG cable is 2 pins shorted together, and a short is a short. Expensive cables don't have "better shorts" than cheaper ones.