Well, my 3rd XS just arrived from Apple. Straight out of the box I set it up as a new phone, updated to 12.0.1, and installed the Speedtest app and ran three tests. Serial # is F17XG5.... for what its worth.
Signal in my office is weak, which I'm thinking is my best option for re-assessing the phone since I have full bars at home.
First 3 Speedtest results (Verizon in Houston) to local Comcast server:
1) 0.74/0.15
---failed to connect for 2nd test...waited a few minutes
2) 0.06/0.07
3) 0.09/0.15
---failed to connect for a 4th test.
3 speed tests taken immediately afterwards with sim back in X (Qual):
1) 8.54/1.04
2) 8.21/1.22
3) 8.44/1.87
Note: both are indicating 2 "bars" of service. I'm pretty close to just totally surrendering at this point.
Just out of curiosity what part of Houston are you in/ Taking these results?