How can I add a .pkpass file to Wallet? I have a .pkpass file which contains the boarding card for my next flight. Can I add it to iOS Wallet or is it not possible to add a .pkpass file? In case it is possible, how can I do it?

I am using iOS 9.2.1 in an iPhone 4S
I had the .pkpass file downloaded to a computer. This worked for me:


send yourself an email with the .pkpass file attached
open the email on the iphone
tap the attachment
'Add' it to your wallet