Best phone for Tmobile coverage

I live in an area of north Texas that has very poor T Mobile reception.  My phone has very poor reception in my area unless I have it connected to my home wifi service.  I can go 5 miles either way and get 3 or more bars but alas at my home sometimes not even 1.   My phone service has been T Mobile for a very long time and this has always been an issue.  Each time I’ve reported this I just keep being told “you need a newer phone”  Have bought several newer phones and it never improves.   I just kept ignoring the issue because it worked at home with wifi.  I don’t have as many temporary outages as some areas.  And I listened to their excuses...we know your area is a problem but we will be adding a tower soon for better reception or 5G will make it better.  None of that has been true.  Long winded I know but since I am retired now and at home much of the time am concerned about wifi outages in my area in an emergency situation.  No wifi...no phone!   Looking yet again to upgrade phone to get better service in this area of low signal.  Any suggestions?   Thank you, Linda