1. Yes, you need to have tri-band handset / BB to have roaming services in US ( and yes, you can roam in DC as well )
2. And, you will be allowed to roam with T-Mobile only across USA
1. Yes, you need to have tri-band handset / BB to have roaming services in US ( and yes, you can roam in DC as well )
2. And, you will be allowed to roam with T-Mobile only across USA