According to Erica Joy, Google’s representative; The original Google+ App has been submitted to Apple for approval and soon it will be publicly available for Apple iOS device users includes iPhone, iPad and iPod Touch. Google is really getting engaged with its social network Google+ and trying to make its Google Plus Project successful after so much failure in Social Network arena. So if you have still didn’t received invitation of Google+ than you can get Google+ invitation from here. However According to CNN Report; many of Google+ "invites" are only lead to adds where people can purchase male "enhancement" pills. It's also likely that some invites could hide downloads of malware or other virus, So be aware of Fake Google+ Invitations and apply directly from official Google+ website.
Google is trying its best to become more socialize amongst people like Facebook users and trying to achieve more social audience with its unique Google+ feature called “Circles”. According to recent report from Sky News, Facebook founder and CEO Mark Zuckerberg has already joined Google+ personally and have setup its own personal account on Google+.