iOS 9.3 is coming in the Spring and will introduce Night Shift as well as a number of other new features.
MacRumors Poll: iPhone 4 Signal Loss by Region
The success of the iPhone 4 launched has been otherwise marred by widespread reports of signal loss. The signal loss seems to occur when the iPhone 4 is held in a certain position resulting in the bridging of the two antenna on the bottom left of the device (see video above). Reports have been varied, however, with many still claiming that the issue does not affect them at all. It's been suggested that signal or tower differences may account for the different experiences.
We've organized this poll to see how common the problem is and broken down by region to see if there are any regional differences.