Have people gone off their BlackBerrys? Earlier this month, BlackBerry users were hit with an outage that lasted several days. It took Research In Motion three full days to restore normal service around the world, and for many users, this just wasn’t good enough. We know a couple of folks personally who said that the service problems were the last straw and what prompted them to change phones. However, it seems like a lot of people are deciding to ditch their Blackberrys this month, and not all because of the service outage.

Gadget trade-in website Gazelle reports that BlackBerry trade-ins are up 80 percent in the last week alone. This is an increase from the record setting number of BlackBerry trade-ins the site saw last month. While the company doesn’t outright blame the outage for the huge surge, the timing would seem to suggest that numerous Blackberry owners decided enough was enough. That said, there’s another major event that has also resulted in a surge of Berry trade-ins.

Speaking to CNet, Gazelle’s Anthony Scarsella said that he reckons the iPhone 4S is to blame. This is “easily the highest volume of BlackBerry trades ever seen period,” he said, including the spike following the recent outage in his statement. However, he added: “In the grand scheme of BlackBerry growth over the past month, it can be pretty much entirely attributed to the launch of the iPhone 4S.”