Apple's mobile phone needs to pay some patent fees to Qualcomm when it is sold, but the iPhone XR doesn't use Qualcomm's chips, and finally Intel was chosen, which caused some minor friction and made the signal of the new flagship iPhone XR somewhat unstable.
After all, modems still have some shortcomings, but overall, the impact is not particularly great. If you pay special attention to users of iPhone XR signal, some Apple phones may find this situation, but for most users, I am afraid it is nothing.
There are some differences in different regions. For today's three major operators, the quality of mobile communication is naturally the best. After all, China Mobile has a huge 4G base station, but many users choose Unicom or Telecom. Because of geographical differences, some users who use iPhone XR will feel worse, and sometimes they will go to places with poor network or even no service, so the signal instability is understandable.