Sprint Rumor LG, how to switch sim cards?

I used to have sprint with my ex husband and used the LG Rumor. I now have a new sprint contract with my sister and used the BB Curve. It broke earlier tonight and I thought I could just switch my SIM cards between the two phones and not have a problem. No such luck. Does anyone know how I can use my LG Rumor (from sprint) with my BB Curve (also from sprint) SIM card??
 
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