It's actually cheaper that way. The company I used to work for was on a unbundled wireless plan, they paid something around $10 a month for a line plus 2 cents per minute. An average user using 300 minutes would get their whole service for $16, compared to a bundled rate of $40.
Unlimited and bundled plans make you feel better, but you realize that half of all users are being overcharged and subsidizing the other half.
yea, not me. maybe i use the phone more, but let's just say that not having to wait for 9pm makes life a lot easier)