Can i use my sim card from t-mobile for my sprint galaxy s3?

Well, I'm sorry to tell you this but no you can't. The Sprint Galaxy S3 has it's own built in 4G LTE sim card thats built onto the board. I was going to try the same thing you're thinking about until a friend of mine at Sprint broke the news to me.
 
I'm sorry but sprint is a CDMA network which means that it does not take sim cards and T-Mobile is a GSM network which does take sim cards
 
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