We seem to have leveled off with about 12,000 rollover minutes in the 'bank', give or take. They accumulate at about the same rate that they roll off. My mother is the only person I can think of within my circle who still has a landline. Her husband isn't well, and they have an AT&T micro-cell in the house because then get absolutely no cell coverage from anyone where there are. About a 1 mile diameter black hole surrounds them. The micro-cell works well, but it's just too risky to go without a hardwired phone for them right now.
Stevefobsfan is probably right. The OP probably ran down to Best Buy for a droid.
Julian, FWIW, we used to have to have a land line to get DSL service, but that requirement is pretty much history now. If they enforced it, the telcos would lose all their customers to the cable TV operators providing Internet service. I tried it for a while. Sure, the speeds were awesome... sometimes. During peak hours, though, they would plummet when every schoolkid in the neighborhood came home and cranked up their bit-torrent clients to download some P**N... DSL may be slower, but at least it's consistent.
I've actually been through the whole cycle with DSL here. When it first became available, it could not be on the same pair as a voice line. Had to be a second drop from the CO. Then they combined them, then they allowed you to split them again. What a roller coaster.