In a T-Mobile Forums post, moderator Kyle made an announcement today that's sure to please those frustrated by the company's decision to charge $1.50 per month for paper billing:

"T-Mobile is committed to encouraging customers to make the move to paperless billing. It’s a great alternative to paper and better for the environment.  Since the announcement we’ve heard everything from kudos to concerns about the move to paperless – especially from our customers who today are receiving paper bills at no charge.
 
So, we’ve decided to not charge our customers a paper bill fee for now. Instead, we'll be taking more time to determine the fairest way possible to encourage people to go paperless.  Customers can still visit my.t-mobile.com to sign up for paperless billing.
We thank our customers for their patience and appreciate people letting us know how they feel about this important topic."

Needless to say, a smart move on T-Mobile's part.  I understand the desire to push customers toward greener (and cost-cutting) concepts, but charging to receive a paper bill is unacceptable, in my opinion.  On that note, I say to T-Mobile: "Taking more time to determine the fairest way possible" doesn't equal charging a fee at a later date.  My recommendation?  Offer a $1.50 credit per month to customers willing to sign up for paperless billing.  You'd probably save more in the long run, anyway - and you would keep your tenured customers from revolting.

Source: T-Mobile