Yes, Samsung Metro XL does support the Tamil language.
No. Samsung Metro XL is a 2G mobile phone.
Yes, you can do that.
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.
Yes, Metro XL does have speaker, which is located on the back side of the phone.