Yes, you can connect this phone to the car Bluetooth.
Yes, Samsung Metro 350 comes with earphones.
Samsung Metro 350 has 1000 contact storage capacity.
Samsung Metro 350 has quite good battery backup. It comes with 1200 mAh removable battery and on a single charge it can last up to almost almost 4 days.
Yes, you can use up to 16GB external memory card with this phone.