Evolved High Speed Packet Access, or HSPA+, is a technical standard for wireless, broadband telecommunication. It is the second phase of HSPA which has been introduced in 3GPP release 7 and being further improved in later 3GPP releases. HSPA+ can achieve data rates of up to 42.2 Mbit/s.
I get a mixture of H+ and 4G but both are fast.