The "4G" in the HTC Amaze 4G refers to T-Mobile's HSPA+ network, which is not the same as 4G LTE being rolled out by Verizon and AT&T.
HSPA+ is more like 3.5G, but the Amaze is one of a few handsets actually capable of hitting the fourth-place carrier's faster 42Mbps data speeds.
Uploads varied between a paltry 1.0 to 1.6Mbps, rather disappointing considering the respectable rates we achieved in the opposite direction.
The built-in web browser (aka Internet) is fairly standard stuff for Android 2.3.4, defaulting to a T-Mobile web2go portal with a mish-mash of Yahoo and CNN news, quick links and other data, which we quickly eliminated in Settings with extreme prejudice.
Android's Gingerbread web browser is standard fare, and remains unchanged here.