I recently switched from a 3G phone (iPhone 4) to a 4G phone (LG G3) and now I'm having this same exact issue. I actually work at the Samsung R&D center located on W Plumeria (though I had no Idea that my coworkers were overloading the towers).

At work, I'm getting download speed of 0.1 - 0.3 Mbps.

In the meantime, on my T-Mobile work phone, I'm getting 10 - 30Mbps download speed.

I can't believe that the last post in this thread was 8 months ago, and this issue STILL hasn't been fixed. Very disappointed.