NO, not $100. T-Mobile only charges $3 a month for a PREPAID PLAN. Includes 30 minutes of talk.
You can order SIM card over their web page for just a couple dollars, but best to go to a store and have them set it up for you for just 15 SIM card.
Put $10 on your account and you are good for 3 months.
Make sure you get the full size SIM although maybe others work with adaptor,,, best to keep it simple.
By whole system is having problems, but $3 SIM is working activated on T-Mobile.