RIM's BlackBerry Curve 8520 is the third generation of the company's compact, full-QWERTY messaging smartphone line. It features the same basic form factor as the original 8300 series devices, but gets some nicely upgraded features and more modern styling in a package that is roughly the same sized as the more expensive Curve 8900. We reviewed a T-Mobile USA version of the Curve 8520, which supports the company's UMA based HotSpot @Home VoIP calling service.Physical AspectsAt 106.5g (3.8oz) in weight and measuring 109mm x 60mm x 14mm (4.3" x 2.4" x .6") in size, the new Curve 8520 is slightly…