How do I change my T-Mobile Plan & Phone?

I just got a new 2 year plan with T-Mobile about 3 months ago, beginning of January.
So far I love my T-Mobile service, they are excellent.

I got the MyTouch 3g in black and the even more 500 minutes plan for $59.99, plus the internet thingy ( 3G, Smartphone ) for $30.00

My phone bill this time will be at about $88.90, I do not use anything on the MyTouch.
I just need a standard flip phone since all I do is talk and text.

Since I have a two year contract can I get like a standard flip phone and change my plan to something cheaper?

Please help.
 
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