Hello and welcome aboard. I dont have an answer for you on this, but I'll redirect you to where you will most likely get an answer for your concern. Here is a link to the T-Mobile - Android Forums.
I wouldn't recommend it. T-Mobile uses the 1700MHz band for 3G data and the Galaxy 5 doesn't support it. While you'd be able to make phone calls and send messages at normal network speeds, your data will only work at 2G speeds.
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