I had a different experience: after some updates, around build 7 or 8 I lost cellular connectivity completely. It said there wasn't carrier data available and that I should update. To update, I needed to verify the download... which failed because it didn't have access to the modem/carrier data, even though wifi should have been enough. Long story short, I had to do a restore from iTunes (another nightmare for me -Linux user-), and after that discover that my backup "wasn't compatible" (fortunately I had made a manual backup of my photos and other content, but all the settings got lost). I've been using iOS for a year now and I definitely miss Android, even if it isn't as polished as iOS.