If you want to know how did the big four mobile carriers do in the last quarter, look no further than the research firm Strategy Analytics report that ranks Verizon, AT&T, T-Mobile and Sprint by subscribers, net adds (including the valuable postpaid segment), and the average monthly churn rate that crudely shows how satisfied the users are with the respective carrier.
That same churn rate is at some pretty historic lows at the big two Verizon and Samsung, and rather high at Sprint and T-Mobile, showcasing very clearly that once Sprint's promos start expiring, and T-Mobile started getting its prices on par with its Verizon nemesis, subscriber loyalty plunged. We recently compared the new unlimited plans of the big four, and there is indeed very little difference in pricing now, save for Sprint, which, however, has some catching up to do when it comes to coverage outside of large cities.
Long story short, Verizon is still the largest, but it's AT&T with the biggest net adds, though most of it came from the prepaid segment. If AT&T keeps going this way, it could soon breathe down Verizon's neck, and it would all have happened on the hush-hush, while we were distracted with its legal fight to acquire Time Warner.