A leaked internal Sprint memo says that the company will be placing limits on the previously unlimited EV-DO mobile broadband data service. If you go over 5GB per month total or 300MB/month while off-network roaming you will be subject to extra fees. Two Sprint employees writing on Sprint user forums vouched for the leak’s authenticity. Now Sprint will no longer be the only carrier to offer actually unlimited 3G service. Somehow I don’t see CEO Dan Hesse bragging about this move while strolling through black and white cobblestone streets.