why does T-Mobile suck

So disgusted with the customer service. My wife upgraded her phone 18 months ago and has had trouble with the phone since day one. It drops calls, cuts out in mid sentence, fails to ring when you call it 5 feet away. We have been to Tmobile store over and over and get the same BS every time. They reboot it they change the sim card they reboot it on and on. Then they send you to Apple and Apple says it's a Tmobile problem and Tmobile says it's an Apple problem. For a few bucks they could replace the phone and be done with it, but nobody will take responsibility. Actually had an apple "Genius" say it was the particular phone number. This goof ball said that certain phone numbers won't work with certain mobile carriers. Should have seen his face when I pointed out that this was the fourth phone my wife has had with the same number and every phone worked fine except this particular phone which has had issues from day one. Apple sucks and Tmobile sucks, not because there is an issue with a product, those things happen, but when they absolutely refuse to stand behind their product and then send you emails telling you what a valuable customer you are you just want to let the world know how truly bad they are. We have apple care and that is a waste of money because they find loop hole after loop hole to tell you they can't replace the phone. I just can't say it strongly enough neither of these companies  deserve your business. If I can convince 20 people to drop Tmobile then I figure that will be just compensation for this crappy phone. Maybe they will figure out that replacing a faulty phone is better than messing people around to save a buck.