@oldtennishoes If they have WiFi Calling included, may alleviate some problems in the house if lack of signal. I also run a business and i found that even though id be outside, and have a signal shown on the phone. People had told me that they had called, but the phone didnt ring. Id get the answerphone message. But id have ‘bars’ on the phone.
Hence the second class citizen quip. Its like the bandwidth was reserved for the primary 3 customers.
Now im back to 3, no problems like i encountered. But thats in a Rural area
That would be a good start, spend a tenner and get a Sim, put it in the phone and give it a try.