Airdrop always not working when I using it between iOS devices, it is very unreliable and fails to work most of the times. If you have any solution on how to get Airdrop working in iOS 9 on iPhone, iPad or iPod Touch.
You can try these ways to fix the issue
Set Airdrop Sharing to ‘Everyone’
Disable and Enable Airdrop Again
Enable Both WiFi and Bluetooth
Sign out of iCloud
Reset network settings and Hard Reset the device