Here's a potential solution for the Google Pixel 6's mobile network issues – Android Police

Science & Technology

Time to put an end to the network connectivity woes
Ever since the Google Pixel 6 and 6 Pro launched, a small subset of users has reported poor network connectivity and slow mobile data speeds. The December security patch was expected to resolve the issue as it fixed several other bugs found in these phones. However, the opposite happened, and the update worsened the problem, with European Pixel users facing severe network connectivity woes. Google acknowledged as much. While an official fix has yet to reach anyone, frustrated Pixel 6 owners have found an easy workaround that puts an end to their mobile connectivity woes, and we've published a guide on how to enable it.
As discovered by Redditor u/vachezoub, installing the latest beta of the Google Carrier services app on the Play Store seems to fix the problem. Initially, he got his SIM card replaced, hoping that would resolve the issue, but it did not help. In the end, installing the latest Google Carrier services beta update did the trick and fixed the problem for good. Several other Pixel 6 users have chimed in on the Reddit thread, saying the fix does seem to work, and they are no longer facing issues with poor network connectivity or slow mobile data speeds. They also report improved signal strength after installing the beta.
Many Pixel 6 users who never faced any mobile network connectivity issues commented that they were already on the beta channel of the carrier services app, which could explain why they have been spared from the network woes. If you own a Pixel 6 or 6 Pro, you can install the latest Google Carrier services beta by joining its Play Store beta program or by grabbing the APK from APK Mirror and sideloading it.
If you have been frustrated with mobile network connectivity on your Pixel 6 or 6 Pro, you should try this solution until Google rolls out a fix. Tests show that the Exynos modem inside the Google Pixel 6 and 6 Pro is not good enough to deliver the same 5G speeds as the Snapdragon modem found in the Samsung Galaxy S21, but it shouldn't struggle to latch on to a network connection.
Installation guide
We've published a how-to guide on installing the Carrier Services beta on your phone. It only takes a couple of minutes and should help restore your Pixel 6 back to its usual state.
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Rajesh Pandey started following the tech field right around the time Android devices were going mainstream. He closely follows the latest development in the world of smartphones and what the tech giants are up to. He loves to tinker around with the latest gadgets to see what they are capable of.