Simultaneous voice and data?

[johnsonwcjw]

Just found out accidently that the lg spectrum also has simultaneous voice and data over 3g

 

[craigrn16]

all 4g devices do voice/data on 4g. like previous poster stated, thunderbolt actually use's 2 1X radios, 1 3g radio and 1 4g radio.

its its radio setup is like 1X/3G, 1X/4G.....thats how its possible. the gnex doesn't use this. the gnex is 1X/3G, 4G.....

What this guy said is right. It just drains the crap out the battery though. I wonder if it also added to the Thunderbolts bulkiness?