Samsung Metro XL comes with 1 year manufacturer's warranty.
No. This phone do not have wireless FM.
You can store up to 1000 contacts in Metro XL. In addition, you can store up to 250 contacts in each of your sim card. So, if you are using 2 sim cards, in total you can store up to 1500 contacts.
Samsung Metro XL weighs around 105 grams.
Yes, this phone does have a calculator app.