Keeping with the trend of being the company’s “fastest selling smartphone ever”, Samsung has just announced that the Galaxy S4 has sold 40 million units world-wide.

Samsung CEO JK Shin revealed this data earlier today while speaking to Korean media regarding speculation that the Galaxy S4 had not sold as well as Samsung had originally expected. The device has been on the market for about six months now, and within the first month, the device had shipped 10 million units worldwide.

For comparison’s sake, the Galaxy S3 had shipped 30 million units after just six months on the market. So despite some speculation that the Galaxy S4 was too similar to its successor to sell at the same rate, the device is clearly doing just fine.

One thing worth noting is that it’s somewhat unclear as to whether JK Shin is referring to sales or shipments of the device. Should it be the latter of those, then Samsung has not actually sold 40 million Galaxy S4 units to customers, but rather shipped them to retailers to sell.