Hopefully someone can clarify this for me. I'm looking at Tmobile's site and am interested in the Even More Plus plan w/ 500 min, unlimited text and data which is $59.99/month.

BUT
Can't I just get the Even More Plus plan w/ 500 min, unlimited text (no data) for $39.99/month and just add the unlimited web feature for $10/month which comes out to a total of $49.99/month?

Whats supposed to be the difference between the unlimited data plan and the unlimited web addon?