I would reccommend doing a factory recet on your phone by going to Settings and then Privacy. After you resetted, go to settings, about phone, system updates, update android and you should see it downloading. This worked for me and I now have froyo.
By the way, you DO have to pay for the sprint mobile hotspot. There really hasn't been a system improvence on performance, but angry brids is really fast.
By the way, you DO have to pay for the sprint mobile hotspot. There really hasn't been a system improvence on performance, but angry brids is really fast.