You can store up to 1000 sms in Metro 350.
Metro 350 has 1200 mAh removable battery.
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 the alarm function.
Yes, Samsung Metro 350 does have loud speaker.