AT&T Galaxy S4 Update Rolling Out Now Adam Mills05/07/2013 On the heels of T-Mobile’s first Samsung Galaxy S4 update comes another as AT&T has also started rolling out its own update for the Samsung Galaxy S4, the first update in what will likely be a long line of them for Galaxy S4 owners. Earlier today, T-Mobile Galaxy S4 owners became the first Galaxy S4 owners in the United States to get a software update. Now, they’ve been joined by the AT&T Samsung Galaxy S4 which is now receiving an update of its own which checks in at just over 20MB in size. The update is a bit mysterious as we haven’t yet been able to figure out exactly what it brings to the table.Advertisement Read: T-Mobile Galaxy S4 Gets First Update. The AT&T Galaxy S4 is getting its first update today. In the case of the T-Mobile Galaxy S4 update, the update made it clear what it was bringing along. That update included ISIS app improvements and visual voicemail improvements as well. The contents of AT&T’s update remain unclear and we aren’t able to pinpoint anything new that the update has brought with it.Advertisement At the very least, the update is now rolling out to owners of AT&T’s latest Samsung smartphone and those who are keen on installing it can find it lurking in the Settings of the device. Checking for the update will prompt owners to download and install the small update and automatically start a process that should only take a couple of minutes to complete.Advertisement Once done, the device will reboot and the new, mysterious update will be on board. Those who are thinking about unlocking their bootloader when the moment arrives may want to hold off on installing this update until the all clear is given by developers. AT&T’s Galaxy S4 ships with a locked bootloader and it may be trying to stay ahead of devs who have come up with a way to unlock it. AT&T’s first Galaxy S4 update is mysterious. The update is the first for the AT&T Galaxy S4 and will likely be one of many for the flagship smartphone. Samsung typically keeps its phones updated for years down the line and often adds new software features with updates that come in between the big ones. It’s unclear when the next smaller update will arrive but the next big update for the Galaxy S4 should be the upcoming Android 4.3/Android 5.0 update. Google is rumored to be announcing a new piece of Android software at Google I/O, thought to possibly be Android 4.3 Jelly Bean or Android 5.0 Key Lime Pie. Whatever the case may be, it will likely be the next, or one of then next updates for the AT&T Galaxy S4.