Since my phone updated itself back in November with the new software version, it won't make or recieve calls, send texts, connect to the internet (data), etc, unless it is showing 3G or 4G on top in the status bar next to the signal strength. I travel alot and sometimes it says it's roaming and sometimes it doesn't, but unless the 3G or 4G is showing, the phone doesn't work regardless of the signal strength. I never had this problem until November. Any suggestions? Also, the display has a jerky motion to it like watching a video stream on a computer with slow internet service. All help is appreciated.
