For the last several months, I am noticing that around Terminal C, I have difficulty accessing ATT cellular data, even though I have two or more bars. While the United or Club Wi-Fi works, I generally shy away due to security concerns. It's exacerbated while on the plane with the cabin door open. I can't send or receive texts or email, again, even though I show 2-5 bars on the phone. On the latest iOS and all other software.

Is anyone else noticing anything similar?