Switch your phone to airplane mode
This will prevent you from being interrupted by calls and alerts.
Start with a full battery
Filming and storing video files use a lot of power. If you plan to film for more than an hour, you may need a portable battery pack
Check your storage
Video uses lots of space on your device, so make sure you have enough. This may be the time to delete some of your old apps and photographs.
Try cinematic mode
With Cinematic mode, your iPhone camera can record videos with a shallow depth of field and add beautiful focus transitions for a cinema-grade look.
Think about what you want to focus on
On many phones, you can lock the focus on the subject by tapping on it on the screen.
Keep it stable
Use both hands or a selfie stick, gimbal stabiliser, or portable tripod. If you don’t have these, try attaching your phone to something solid (a small water bottle or broom handle) with a heavy-duty rubber band or hair scrunchie. For tablets, hold securely with both hands.
Avoid zoom on the phone
It’s better to move nearer to the subject to create close-ups than it is to use the phone’s zoom function.
Don’t forget the sound
Get your microphone close to the sound that you want to record. Most phones are supplied with headphones with a quite good microphone. Use this to get better sound quality.