This is why you keep backups of your TOTP authenticator keys. I was really put off by 2 factor until I figured a way to do a backup. Authenticator URLS look like this:
You can save it in some passworded zip archive somewhere or print it out. If you print them I suggest printing them with QR codes to aid in recovery speed. You can easily generate QR codes by putting the text URLs into a QR code generator. If you just have a QR code, use a general QR code scanning app to extract the string.
Also the new google authenticator version has a %100 repo crash bug when you scan two QR codes in a row on iOS 7 phones.
otpauth://totp/KeyNameHere?secret=SECRECTKEYSTRINGHERE
You can save it in some passworded zip archive somewhere or print it out. If you print them I suggest printing them with QR codes to aid in recovery speed. You can easily generate QR codes by putting the text URLs into a QR code generator. If you just have a QR code, use a general QR code scanning app to extract the string.
Also the new google authenticator version has a %100 repo crash bug when you scan two QR codes in a row on iOS 7 phones.