AT&T's earnings call for the last quarter is on today and they've revealed that last quarter they sold 2.7 million iPhones out of a total share of 17.07 million iPhones that Apple sold over the same period. Unsurprisingly however, other non-iPhone, smartphones have become increasingly popular for AT&T with activation of 2.1 million such devices. iPhone activations were down significantly from the previous quarter in which they activated 3.6 million iPhones - although keep in mind that Apple also saw a decline in iPhone sales this quarter.
At the earnings call AT&T also noted that they had activated more than 1 million iPhone 4S' as of Tuesday this week, making it AT&T's most successful launch. For comparison, Sprint saw 200,000 pre-orders on the iPhone 4S launch day. Verizon has yet to reveal specific numbers for iPhone 4S sales, but have said they were very pleased with the reception.