Inconsistent text tones from non-iPhone users
When receiving texts from non-iPhone users on my iPhone 12 pro, there are usually no text tones. This started when I first received the phone in December 2020, and my software is up to date (14.4.2) according to my phone. While I always receive text tone notifications from other iPhone users, I usually receive no sound notifications for texts from Android users. I have sounds selected and set to full volume. Making the problem particularly tough to diagnose is the fact the phone sometimes (but usually doesn't) sound when receiving texts from a particular Android user. There doesn't seem to be any connection between the problem and whether the message app is open, the phone is awake or asleep or Wifi is enabled. I've closed apps, checked settings and restarted my phone several times, but nothing seems to work. The problem has persisted through at least three software updates. I've also noticed a weakening of my signal since upgrading from an iPhone 8. I live in the country, and I wonder if reception or limited availability of cell phone towers could have anything to do with the problem. Even so, that wouldn't explain why connection and signal strength was better at home with iPhone 8 than with iPhone 12 pro. I'm running out of tricks to try.
iPhone 12 Pro, iOS 14