You only need to do this once. After enabling Developer Mode, it stays on until you manually turn it off.
Enable Developer Mode
1
Connect your device via USB
Plug your iPhone or iPad into your computer using a USB cable.
2
Trust the computer on your device
When your device prompts you with Trust This Computer?, tap Trust and enter your passcode if asked.
3
Open Settings
On your device, open the Settings app.
4
Go to Privacy & Security
Scroll down and tap Privacy & Security.
5
Tap Developer Mode
Scroll to the bottom of the page and tap Developer Mode.
6
Toggle Developer Mode on
Tap the Developer Mode toggle to turn it on. iOS will warn you that Developer Mode reduces security — tap Restart to continue.
7
Restart your device
Your device will restart. After it boots back up, you’ll see a prompt asking you to confirm Developer Mode — tap Turn On.