Most mobile phone provider offer “Wi-Fi Calling” meaning your phone will use wifi to call & send SMS. Check your phone & turn on that option.

You can either get a 4G / 5G outdoor antenna or change your mobile provider hoping it’s better than the old one.

Otherwise, there isn’t much you can do.

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Move home or work around the signal limitations.

For android, I use an app called Connection Stabilizer Booster which helps to some extent using some tricks and optimizations, no magic though. Worth a try!

Only real solution is installing a cell network booster with External antenna for cell connectivity, and adding additional access points for wifi.