Never seen "H" or "H+" sign of 3G? Don't worry!
If you are using img 0001 or 0002 of Replicant 4.2,
you must not see "H" or "H+" sign of 3G.
Depending on radio condition and your contract with carrier,
Replicant could work with faster 3G like UMTS, HSPA and HSPA+.
However, with build 0001 and 0002, the sign still remains on "3G".
On the other hand, if you run a image built from the latest sources,
we can seee "H" or "H+" sign already,
so I believe this change will be included in the next official build.
I talked about this with Paul over IRC,
and I wish this post would be helpful for some users' worry.
I'm one of this users, for which this post is helpful, (because I was on the verge of opening a topic for that).