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This update worsened the phone's cell reception problem. In weak signal area, if the phone loses the signal completely (empty triangle), it will not reacquire the signal until you move to an area with stronger signal. Before this update the phone would, with some difficulty, but get the signal back (or not lose it at all). Here I have to note that the re-acquisition of the signal happens faster than before B25, so clearly some work was done to improve the corresponding code.
The LTE Discovery app reports around -114 dBm Band 4 as I enter this area. Then the reading starts fluctuating up and down between -117 and something like -128, to as bad as -140, at which point the phone shows No service. As I said, in identical circumstances and before the update the signal was weak but stable and usable. Unfortunately I did not take any signal strength readings at the time.
p.s. I'm on T-Mobile, if that makes any difference.