The iKlip A/V from IK Multimedia is a sturdy handheld grip for smartphones which features a built-in microphone preamp as part of its construction. It comes stocked with a side clip for wireless systems, should you choose to utilize those. Conversely, you can opt to plug a microphone straight into the iKlip's XLR input, and once connected, connect the microphone into your smartphone's mini-jack via a 1/8" cable. The unit runs on two AA batteries.
Don't let the lower-case "i" in the name fool you: the adjustable vice grip is compatible with android devices, iOS devices, or any smartphone with a screen size between 3.5" and 6". Its preamp supports 48V phantom power and sports controls to change the gain, thus allowing the smartphone holder to control the volume of the microphone in use. Such a feature renders this unit suitable for on-the-go reporting, improved home videography, and the burgeoning business of the iPhone motion picture.