My iphone 7 always had a great signal until I updated to ios 14.1. I also temporarily lost ALL of my messages history. I did a soft restart and that worked temporarily. I then took out my sim card and use a super fine piece of sandpaper to clean the sim card contacts both on my sim card and inside the iphone by cutting a small piece that would slide into the sim slot. I then did a hard reset and so far my signal has been good.
Jonathan7298
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