Count me in the list of people having LTE and WIFi issues with the iPhone XS.
Upgraded to a XS from 6 (not by choice. The 6 died on me)Since upgrading the XS has had very noticeable degradation of LTE strength. I work in the financial district of the city I live in and XS cannot get a LTE signal. It’s always connected to 3G only. Was NEVER the case with the 6.
I sit side by side with a colleague with a X on the same network provider and his phone has LTE while mine is 3G.
At home I use google WiFi with 4 nodes. I put my XS, 6s and 8+ side by side and did a WiFi test. 6S 300MB/S, 8+ 300 MB/S, XS 100 MB/S
Called apple support and went through the usual troubleshooting and nothing worked. At the end of it I was advised by apple support to exchange the phone for a new one.
Extremely disappointed that a 1k phone behaves this way. Checking emails is a challenge. Let’s not even talk about YouTubing (I.e an impossibility).