Lots of 4G but, 3G, Not so much. | Phone/Device Issues and Features | Consumer forum

I have left/set my HTC Evo 3D in HSPA ONLY mode, I receive a 3g and a 4g signal using this setting but I have noticed that I only transmit and receive data on 4g. It's a little odd. I might be moving data in 3g but when ever I am staring at the screen the only time I see data transmission occurring is in 4G mode. It's smoking fast, so I'm not really complaining. Just wondering if someone could shed some light on the subject, or if anyone else has noticed the same thing.