Not on a phone , but believe it or not, the latest advances use the system from MSFT kinect sensor.
This is pixel oriented, no moving parts and hyper accurate. These are found mostly in UAV and helo platforms.
On the iPhone/iPad gyro...
Gyroscope: Starting with the iPhone 4, 4th Gen. iPod touch, and iPad 2 there's another sensor: a three-axis gyroscope. When combining the gyroscope with the accelerometer, this combo gives these devices six axes on which it can operate. This is designed to make the devices more sensitive, responsive and powerful for gaming, allowing them to react based on how the devices are held and moved.
The iPhone 4 utilizes a microscopic, electronic version of a vibrational gyroscope, called a MEMS gyroscope. Chipworks has confirmed that the MEMS gyroscope found inside the iPhone 4 is nearly identical to an off-the-shelf TMicroelectronics L3G4200D gyroscope.
When a user rotates the phone, the proof mass gets displaced in the X, Y, and Z directions by Coriolis forces. An ASIC processor senses the proof mass' displacement through capacitor plates located underneath the proof mass, as well as finger capacitors at the edges of the package.
Accelerometer/Motion sensor: This sensor enables the iPod touch, iPad, or iPhone’s screen to
automatically switch from landscape to portrait modes and back again based on whether you’re holding the phone vertically or horizontally.
I added this, and it comes in handy when buying used equipment...
Moisture sensor: All of these devices contain this sensor, though it's not visible in the onscreen interface or accessible through the iOS. The moisture (or water) sensor is a little red tab that appears in the Dock Connector after the phone has been submerged in water. It can also appear as a red dot in
the headphone jack, depending on the model. If you're
buying a used iPhone, it's a good idea to check for this indicator to make sure the device hasn't been damaged by water.