Can I use hotspot feature while my phone is also connected to some other wifi . [I want my phone to use Data from the wifi it is connected to, and connect my laptop to my phones hotspot, and use the same wifi connection to which my phone connects, so that i must not be charged for data on my phone.]
What you're describing is not the functionality of a hotspot, but a bridge/gateway device. Why can't you connect the laptop directly to the same WiFi the phone is connected to?
I don't think you can do it. Here's one application where it would be useful:
You're traveling and in a hotel. You purchase (@$15/day) WiFi access. You can only connect one device per room (they limit base on IP). You want to share your one connection so you don't have to pay twice.
take a regular router with you, clone the MAC address into the router that way they can see only the one device registered at the front desk with, and you can access the internet from all devices that connect to the router and the Hotel will not be the wiser.
