Perhaps the speed/connectivity issues are the result of the way the current towers are setup. And perhaps Sprint is working on a fix, which my explain the holdup on further deployments. Just speculating...
verizon and att are just ridiculous. my gf gets LTE on her att gs3 indoors everywhere. All the while i'm struggling to get sprint LTE outdoors on my note3...
I think the white pins only appear when ppl post pictures of the towers. So more white pins in an area may just mean more members taking pics there, not necessarily more actual tower development going on.