can i use tmobile htc sensation if i was using a 3G phone before?

Pit

New member
I owned a tmobile hd2 and it was 3g but it broke and i bought a htc sensation on ebay. I put in my sim card and microSD but whenever i try to go on the internet, it tells me I have to upgrade my plan? I only had my plan for about one and a half year and i dont want to upgrade it. is there a way to keep my same plan on the sensation phone?
 
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