CallNow is a kind of a tweak that uses the intelligent gesture recognition technology of the iPhone and allow you to call or text your favorite numbers with a predefined gesture. The tweak has been developed by Philip Bigarella and is available in Cydia for free.
Once CallNow is installed you’ll see a new settings section that allows you to enter a single phone number. Once you have your favorite number setup, you can then enable an Activator action to invoke the dialing of your favorite number.
CallNow will be available very soon on Cydia, but if you can’t wait you can download it and install via iFile using this link.