BLU Products unlocked smartphones have only been truly useful in North America when using bigger carriers like ATT and Rogers, but the company is giving us a few more choices today. Its new Advance 4.0 and Studio 5.0 II both support HSPA+ data on smaller networks like T-Mobile, Solavei and Wind Mobile; if you want to jump to a cheaper provider, you wont have to give up 3G in the process. The handsets are otherwise modest.