Open the Contacts app on the source iPhone
Select the contact you want to share
Tap Share Contact
Choose AirDrop
Select the receiving iPhone
On the receiving iPhone, tap Accept
Repeat for each contact you want to send
To send multiple contacts, open the Contacts app
Use a third-party app or export contacts as a vCard if needed
Share the vCard via AirDrop
On the receiving iPhone, tap Accept
Import the contacts if prompted
Make sure both iPhones have Wi-Fi and Bluetooth turned on
Make sure AirDrop is set to Contacts Only or Everyone
Keep both iPhones close to each other
Unlock both iPhones during the transfer