Hrm, I checked it myself and I'm getting 15mbit/s and the about status just says HSPA
Sometimes it used to says HSPAP, maybe android simplified it.
15mbit/s is definately HSPA+
The only real difference is greater upload speeds 3G had slower uploads than the couple mb we get now.
I think technically anything over 14.4 down is HSPA+
But it looks like Android has chosen to simplify it.
UTMS is definately 3G
Nexus 5 (Personal)
HTC First (Work)
Retired Phones: AT&T Galaxy S4, Nexus 4, AT&T Galaxy S II,GSM Galaxy Nexus,HTC Rezound, Thunderbolt, Captivate, Focus (WP7), Blackberry Torch, iPhone3GS