No. this phone do not have video player but this phone do have music player.
Samsung B310 comes with 800 mAh battery. But it is very efficient. You do not require to charge the phone for almost 3 days with moderate usage.
No. Samsung Guru series phones do not have this option.
Yes, Samsung Guru Music 2 has speed dial function.
No. You cannot use 4g network sim cards. You need to select 2G network for your sim card and then you can use it.