Google has decoupled many system features from Android over the years to allow for seamless over-the-air updates, making millions of phones that don't receive new firmware releases as often as they should more secure. But sometimes, things go wrong despite this approach. This time around, we've received reports of people complaining about SMS sending and receiving issues following an update of the Carrier Services that has been rolling out over the past few days. Google has reacted swiftly and has already pulled the update, downgrading most phones to the previous version.