Using the app ‘Bar-Code’ and an HTML wallet from Blockchain.info you can use bitcoin on an iphone. Here’s how.
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Step 1) Install the Bar-Code Scanner app from the App Store
Step 2) Signup for a Wallet at Blockchain
(I suggest you logout and login a few times to make sure the wallet is set up properly before sending any Bitcoin to it- also verify your email. I’d also suggest you enable 2FA- 2 factor authorization to prevent hacking.)
Unlisted- Step 3) Download the AUTHY app on your iPhone. Login to the wallet online, enable 2FA- to secure your wallet against hacking.
Using the Wallet:
1) Use the Bar-Code Scanner app to scan the QR code of the receiver address
2) Open the Blockchain wallet, click send money, quick send, then paste in the QR code
3) Enter in the amount you want to send
Test logging in, receiving and sending small amounts of Bitcoin.