Yes, you can use Sony MBH20 with micromax mobile phone.
Yes, it does have call receive button.
Sony MBH20 comes with 1 Year brand warranty.
No. Sony MBH20 do not have volume control button. You cannot increase or decrease call volume but you can use your mobile phone's call volume control button for the same.
Yes, you can use Sony MBH20 with any Nokia mobile phone.