Just wanted to give folks a heads up that iOS content blockers like Purify + Google Analytics may be breaking your form. There are no error messages displayed to the user. Simply nothing happens when the user hits submit. Eventually users give up and walk away.
In our case, we only found out because a user was kind enough to notify us via Twitter that they were unable to request our eBook using this form:
When we tested internally, it worked on some iOS devices and not others. The only difference we could think of was the Purify content blocker installed on some of them. When we turned off Purify, the form worked on all of our test devices.
Unbounce support has confirmed the behavior and says the problem is due to Google Analytics:
I chatted with our team about the best way around this, and basically what happens is the content blocker prevents Google Analytics from tracking behaviour, which then blocks our form from submitting. Your best bet to get this resolved quickly is to turn off event tracking with GA, as this is the portion that the content blocker is blocking.
For now, we’ve simply turned off GA entirely and the form seems to be working even with Purify turned on.
I suspect lots of Unbounce conversions may be affected by this issue given the popularity of content blockers on iOS 9.