I'm sorry the carriers you deal with are so shit but until mobile data transfer becomes a government utility (and let me tell you, there's a reason telecoms are scrambling to diversify) they do have to make a profit. In most markets the margins are razor thin and new radio technologies (4G, 5G, 6G) are costing more and returning less.

So when poorly regulated markets let them merge into monopolies, or they cut costs by reducing human customer services, "based, I stole a phone from a shitty company" should hopefully be also followed up by you supporting legislation to make mobile data a government utility.

For reference I work in an EU telecom and our industry is heavily regulated. If software companies or supermarkets were hammered for what they do with the data we "just" transfer, they'd be a lot cleaner too.