Hello all: I searched and didn't find anything particularly useful. Also, it's a really simple question, but I don't want to mess it up

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I bought the 500 minute/$10 web2go plan with only a sim card, because I already have a dumbphone. I also have an unlocked 3GS running 4.1 that currently is using my T-Mobile prepaid plan. I'm not positive that I can run internet on my dumbphone (Motorola V195).
For activation--do I activate my SIM in my iPhone or the Motorola? Is there another route--ie, using an IMEI from another phone that I don't have, so I don't run into any problems if my Motorola phone can't use internet?
Do I need to install the T-Mobile tools? How long will I have to wait before the internet starts working?
Thanks!
Joshua