Mobile
The only thing you need is a smartphone with a good camera and the correct software to take the most of it. That is why iPhone comes first when a journalist thinks on a good equipment, although nowadays a high-end Android smartphone comes with a suitable camera. Apps are evolving fast, so you can have the same capabilities in both Operating Systems. Just have a look to http://www.vimojo.co to find out one of the best apps at the moment.
Tripod
Smartphone cameras are being improved, and now they come with specific stabilization software. To have a good shoot you need to hold up your phone. Just lying the device on a ledge should do it, but sometimes there is no ledge near to you. So it is important to have a light tripod, the ones used for photographs are perfect for your phone.
Microphone
Here comes the worst piece of hardware of any smartphone because they are not designed to take the sound from far away. That is why you need to improve this part of your MOJO kit. Just take into account that minijack input from phones needs to have the 3 crowns in order to work properly with your mic. If you already have a mic you can use an adapter from TRS to TRRS.
Selfie stick
One important thing about MoJo is that you can develop a new audiovisual language and with the stick, you can shoot video from many different angles: You can take a higher shot or even shoot yourself. Be creative and take a shoot in a distinct way.
Rig / Grabber
In order to record with the mobile on your hand, you need one of those. It gives you more stability and you will have more steady sequences. I recommend you to use the ones from Shoulderpod.
Led torch
Light is also very important to have the perfect shot. For close interviews, if you use a led torch you will avoid strange shadows that make your face look blurred.
Extra Battery
Shooting videos will drain your battery. Always be sure to begin any recording session full of battery in your smartphone. Carrying an extra battery or a portable charger will ensure you do not run out of battery while taking the best shot.
This tips are also useful to any video creator and dtubers