In order to get my phone to switch back to sprint towers, I went close to a known sprint towers then performed a "profile update" on the phone and it's been on sprint signal since
I've had to force us Cellular while working in Fremont, be since a Sprint tower is out and gave me 1 bar service from surrounding towers which was unusable. Least I can download with us Cellular, although there is no upload speed
While beta testing I noticed my SD card was formatted and would randomly not show up in storage option- also photos I took with SD card as the storage area disappeared after about 10 minutes (even after viewing the photos in gallery) pretty big bug to not be fixed