Minimum voice plan $40/month
Unlimited texting $20/month
AT&T Data plan - 200mb - $15/month OR 2gb - $25/month
Verizon Data plan - $30/month
So, on AT&T, your bill would be a minimum of $75 and a maximum of $85 plus fees and taxes.
On Verizon, your bill would be $90 plus fees and taxes.
And the 2011 iPhone is less than 4 months away.