The question is should I use ziphone to unlock my iPhone or not? Does it have any disadvantages that can be covered by using a different unlocking software? I have gone through Ziphone tutorials on youtube, but they all detail different steps. Some basic questions:
1. How to check firmware version of my iPhone?
2. Can ziphone 3.0 unlock iPhone with any version? If yes, then why does some tutorial want me to do some firmware upgradation.
3. Does the sim need to be present when doing unlocking using ziphone?

Thanks.