Yes, Samsung Metro 350 does have call recording option.
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, Samsung Metro 350 does have loud speaker.
Samsung Metro 350 comes with 2MP camera and it also has the zoom function.
No. Youtube App is not available for this phone.