Horrible internet service

I own a construction business and for the past two years the internet seevice has either 1 line or sos on an iphone 16pro max, ever since 5g and possibly 4g the service we have in america is [Edited: "Inappropriate Language"], i go to greece every year and the i lnternet is so much better provided by xfinity somehow, the only reason why i havnt switched is because my friends all complain about theirs and they have verizon and atnt but it seems like theirs is still better wherever we are!