At this time, there is not.
However, we are exploring the idea of creating a web version that can be used on any device.
Please keep an eye out here or on Google+ for more info when we can share it.
You shouldn’t have to do anything special, but sometimes firmware updates can screw with permissions. If you are getting crashes you may want to try uninstalling and reinstalling the app.
If that doesn’t help please get our email address from the app listing and shoot us a message so we can help you further. Thanks!
To unblock a number, go into your contacts, scroll all the way down, and any contacts you’ve blocked with the app are listed as zzBlocked_.. ..delete the one you want to unblock.
If that doesn’t work, it means that you have another copy of the contact blocked independent of Reverse Lookup. Also, press your phones menu buttons, and then “contacts to show”, and make sure you are viewing all contacts. The wording may be slightly different depending on your device.