I'm assuming from what you say that somehow you're using your iphone wallet as your main bitcoin wallet ?
That's totally wrong on many levels.
Not just if you had to reset your phone, but what if the phone gets lost or stolen
Not a good idea.
Here is what you should do:
-Download a good pc wallet such as electrum.
-Save your private keys or even print them out and keep them in a safe place.
-Now since you want to use your iphone wallet, one of the best apps out there is the blockchain.info app.
-So import the private keys of the address you created on electrum to your blockchain wallet.
-Link it to your phone
Now your phone has no danger on your coins. Whatever happens to it, you still have your private keys and can spend them any time.