I just discovered I had this problem, and a reset of network settings seems to have taken care of it.
In my case, the problem is possibly due to installation of a vodaphone carrier bundle recently while abroad, and then simply removing the profile when I returned instead of reseting the network also.
In my case, the problem is possibly due to installation of a vodaphone carrier bundle recently while abroad, and then simply removing the profile when I returned instead of reseting the network also.
