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No. Java apps are not supported.
No. You cannot use Jio sim card in this phone.
Yes, Samsung Metro XL does have call conference facility.
Yes, you can do that.
No. This is not android phone.
What I liked most about this phone is the user interface. It is very simple and people of all age can use this without any trouble. It has local language support. And the phone battery is excellent. With lot of calls, a little bit of internet browsing - I need to charge only once in 3 days. The display is quite big and overall, this phone is truly Pocket Main Rocket.