HSPA+ is not all that slow. I don't know its limits but I use to see near 7 Mbps down in a very challenging area of Denver. A boosted signal doesn't always fix everything either. My Mobley is on 4G from some far off tower while remote boondocking in the Rockies. All the booster does is keep it connected when that far off tower becomes congested at 9 am everyday. It can be slow but without the booster and directional antenna, it is nothing. Sprint and T-mobile are often like that. Show no signal until they hit the cradle.
