On this video by the basic filmmaker takes a look at an interesting sound recording accessory called the Saramonic SmartRig XLR which allows you to connect more or less any type of XLR mic or input into your smartphone.
If your main recorder is not available there is a simple and inexpensive way you can still record using your favourite XLR mic – directly into your smartphone. This can be done using a pretty inexpensive adapter by Saramonic called SmartRig XLR.
The SmartRig XLR uses a 9v battery (we actually hate these but they are common on lots of sound devices), has an XLR input with phantom power and a 3.5mm output as well as headphone jack (although some people who tested the unit claim the headphone has a slight delay).
Here is a quick demo of the Saramonic SmartRig XLR:
The Saramonic SmartRig XLR is pretty inexpensive so if you need a backup – just in case to be in your bag – you can get one for under $23.
On LensVid we have a very extensive section devoted to sound recording for video productions which covers both equipment and techniques here on LensVid.