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Samsung phones actually come with a good quality antenna. It is hard to find a brand or model with a good antenna due to several factors involved. Here is a list I found --> https://smartphonesrevealed.com/phones-with-best-antenna/?showall=true
There are some possible solutions to your issue. Who is your network provider? Some providers let you install home boosters to increase coverage in your area for a fee.
Some providers let you setup WiFi calling on your phone, so you can make calls through your phone even if you don't have a cell signal or has low signal.
No problem. WiFi calling has to be supported by your carrier network as well, then only it will work after enabling that feature on your phone.
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