I activated my 3GS with my husband's line (from v1 phone), then put my old 3G sim in 3GS and put the 3GS sim in the 3G for him.
So I am using my old 3G sim in 3GS and I have no problems with calls or data. Everything works fine.
Did they say why they wanted new sims in 3GS? Maybe only to discourage switching lines that are not eligible for upgrade...
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