Example of one of these is the Huawei E1552 on 2degrees. You can unlock voice capability using DC-Unlocker.
As far as i can tell the ZTE MF626, MF180, MF190 all don't support this, though i could be wrong. There's also the Sierra 326u, but that seems to also lack voice.
If anyone has a T-Stick and can confirm voice capability (or lack of) via the free version of DC Unlocker that would be useful.
Objective is linking it up to Freeswitch (http://wiki.freeswitch.org/wiki/GSMopen#Voice_calls_and_SMS). Unless someone wants to sell me a cheap WCDMA SIP Gateway :p