[QUOTE=BigBossMan;446320]10G is paying for a ton of data. You must watch video or listen to music. I use less than 2G a month.[/QUOTE]Most music services don't count against your data allowance on T-Mobile.
The 10GB is a family plan promotion (4 lines for $120) and all the lines have to have 10GB or more. Individual plans start at $30 with 1GB of data.
The international roaming service is great as long as you accept that it only comes with 2G speeds. If you buy your phone on one of the T-Mobile promotion plans, it's locked so a local SIM isn't an option.