Apple announced Monday that it sold more than 4 million iPhone 4S units in the phone’s first weekend on the market.

The handset, which debuted in seven countries on Friday, broke the sales record in just three days. By way of comparison, the iPhone 4 sold more than 1.7 million units in its first weekend, though that handset was launched in just five countries and on fewer carriers.

While the iPhone 4 was initially available only to AT&T users, this time around Verizon and Sprint were also launch partners for the phone. In a Friday statement, Sprint product chief Fared Adib said that the company “reported its best ever day of sales in retail, web and telesales for a device family in Sprint history” as of 1 p.m. Eastern time. AT&T said Friday afternoon that it had already activated a record number of iPhones on its network and was on pace to double that.

Sales figures are exactly in line with analyst estimates reported by Bloomberg News on Friday. Apple also reported that more than 25 million people are already using iOS 5, the company’s latest operating system. Users had reported problems upgrading to the new software last week because of increased traffic on Apple’s servers.

Apple is due to report earnings for its latest quarter on Tuesday afternoon, after the closing bell.

The phone will roll out in 22 more countries on Oct. 28 and 70 more countries by the end of the year, Apple said in a statement Monday morning.

Related stories:

Apple’s iPhone 4S in stores today

iPhone 4S: sales set records, activation issues irk buyers

Siri inspires a Tumblr or two, answers more goofy questions

Apple iPhone 4S review: It’s the software that’s a surprise